Ques:- A train 240 m long passed a pole in 24 sec. How long will it take to pass a platform 650 m long?
Recent Answer : Added by dumeel kuppam vavvaalu On 2021-08-25 14:15:33:
From the first statement
Speed=distance/time
=>240/24=10m/s
so speed=10m/s
From the second statement
distance=length of the platform+length of the train=650+240=890m
Time=distance/speed
here, the speed of the train is already calculated
=>890/10=89s
So the time taken by the train to cross the platform is 89 seconds
Ques:- The tens digit of a two-digit number is two more than its unit digit. The two-digit number is 7 times the sum of the digits. Find the units digits?
Recent Answer : Added by Jay On 2022-08-14 16:35:32:
31
Ques:- a student got 70% in one subject,80% in other.to get overall 75% how much he should get in third subject
Recent Answer : Added by Admin On 2020-05-17 12:00:01:
75%
Ques:- A Man is sitting in the last coach of train could not find a seat, so he starts walking to the front coach ,he walks for 5 min and reaches front coach. Not finding a seat he walks back to last coach and when he reaches there,train had completed 5 miles. what is the speed of the train ?
Ques:- 3 cubes of metal whose edges are 9, 12 and 15 cm respectively, are melted and one new cube is made. Find the edge of the new cube?
Recent Answer : Added by Anna On 2021-10-22 09:13:17:
let a = 9 * 9 * 9;
let b = 12 * 12 * 12;
let c = 15 * 15 * 15;
sum = a + b + c;
edge = Math.cbrt(sum);
console.log(edge);
Ques:- As you very rightly pointed out, kids nowadays are spending more and more time in front of the television or playing video games. The effect of media on children today can be harmful. Do you have any advice to parents regarding quality of content their ki
Ques:- what are you know about our company
Ques:- Sangeeta remembers that her father’s birthday was certainly after eight but before thirteenth of December. Her sister Natasha remembers that their father’s birthday was definitely after ninth but before fourteenth of December. On which date of December was their father’s birthday?
Ques:- When x is real what is the least value of (x**2-6*x+5)/(x**2+2*x+1)
Recent Answer : Added by Admin On 2020-05-17 12:01:23:
(x**2 – 6* x + 5) = (x-1)*(x-5)
(x**2 + 2 * x + 1) = (x + 1) * (x+1) = (x+1)**2
For what x is (x-1)*(x-5)/( (x+1)**2) a minimum?
One way to answer this question is by using calculus.
Take the derivative, and set to zero.
Since this is a fraction of polynomials, and a fraction is
zero only if it’s numerator is zero, we need calculate only
the numerator of the derivative and set it to zero.
The numerator of the
Derivative of (x-1)*(x-5)/( (x+1)**2) is
( (x-1) + (x-5) ) ( x+1)**2 – (x-1)(x-5)( 2 (x+1) )
= (2 x – 6) (x+1)**2 – (2) (x-1)(x-5) (x+1)
= 0
Divide through by 2 (x+1)
(x-3)(x+1) – (x-1)(x-5) = 0
(x**2 – 2 x – 3 ) – (x**2 – 6 x + 5) = 0
x**2 – x**2 – 2 x + 6 x – 3 – 5 = 0
4 x – 8 = 0
x = 2
Plugging in x = 2 into the original
(x**2-6*x+5)/(x**2+2*x+1)
gives us (2**2 – 6 * 2 + 5)/(2**2 + 2*2 + 1)
= (4 – 12 + 5) / (4 + 4 + 1) = -3/9 = -1/3
Least value is -1/3
Ques:- A snail is at the bottom of a 20 meters deep pit. Every day the snail climbs 5 meters upwards, but at night it slides 4 meters back downwards. How many days does it take before the snail reaches the top of the pit?
Ques:- Tell me something about youself
Ques:- P and Q can do a piece of work in 3 days, Q and R in 4 days, R and P in 6 days. How long will R take to do it?
Recent Answer : Added by anyonmos On 2021-07-14 14:32:04:
2 and half day.
Ques:- cost of an item is Rs 12.60 7 profit is 10% over selling price what is the selling price
Recent Answer : Added by Admin On 2020-05-17 11:59:33:
Rs.13.8677
Ques:- Do you have any experience?
Ques:- Are you are from financebackground? Why you are opting for marketing job?
Ques:- What is the disappointment in your life?
Ques:- What was your work profile ?
Ques:- Two pipes can fill a tank in 18 minutes and 15 minutes. An outlet pipe can empty the tank in 45 minutes. If all the pipes are opened when the tank is empty, then how many minutes will it take to fill the tank?
Recent Answer : Added by Shahbina On 2022-08-24 17:03:17:
1 tank will fill in 10 minutes.
Ques:- How to detect virus in PC ? Why a file prefixed with '~'symbol is said to be virus ? Is it true that the PC is infected with virus when we find any such files ?
Ques:- What changes would you make if you came on board?
Ques:- How many kg of sugar costing Rs. 11.70/kg must be mixed with 24 kg of sugar costing Rs. 8.1/kg. So that there may be a gain of 15% by selling the mixture at 9/kg?
A. 6 kg
B. 7 kg
C. 8 kg
D. 10 kg
Recent Answer : Added by Admin On 2022-09-23 19:17:07:
C. 8 kg
Ques:- The difference between the compound interest compounded annually and simple interest for 2 years at 20% per annum is Rs.144. Find the principal?
Recent Answer : Added by Atif On 2022-12-05 16:13:26:
3600
Ques:- Teachers hate me.cows like me.monkeys eat me.Its a nine letter word. second letter is “o” and eigth letter is “y” what is that word.tell me urgent.
Ques:- What is the advantage of the team work?
Ques:- Why do you want to work for this company?
Ques:- Surface area of two spheres are in the ratio 1:4 what is the ratio of their volumes?
Ques:- If you were given a box of pencils, list 10 things you could do with them that are not their traditional use?
Ques:- What is your achievements ? why do you think it is significant for this job ? what are the challenges you face and how do you achieve them.
Ques:- A man can row 6 kmph in still water. When the river is running at 1.2 kmph, it takes him 1 hour to row to a place and black. How far is the place?
Recent Answer : Added by Durgadevi A On 2022-09-18 08:59:16:
2.88
Ques:- A wizard named Nepo says “I am only three times my son's age. My father is 40 years more than twice my age. Together the three of us are a mere 1240 years old.” How old is Nepo?
Recent Answer : Added by Chetan On 2021-07-16 09:53:52:
360 years old
Nepo’s son age = x
Nepo’s age = 3x
Nepo’s father age = 2*3x + 40
From the first statement
Speed=distance/time
=>240/24=10m/s
so speed=10m/s
From the second statement
distance=length of the platform+length of the train=650+240=890m
Time=distance/speed
here, the speed of the train is already calculated
=>890/10=89s
So the time taken by the train to cross the platform is 89 seconds