Ques:- 2 men are walking towards each other at constant speeds.A train starting at one end crosses the first man in 18 seconds. After 10 minutes it meets the other man and crosses him in 12 seconds.(i am not sure of the values).Find the time when the 2 …
Ques:- Passenger train and Freight train passing on parallel tracks. Passenger train takes takes twice as much time to pass the Freight train when moving in same direction and also the same time when moving in the opp direction. How much faster is the passanger train?
Ques:- Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time which they take to cross each other is?
Ques:- Find out the wrong number in a given series.
3, 7, 15, 39, 63, 127, 255, 511
A. 7
B. 15
C. 39
D. 67
Recent Answer : Added by Bharath Teja On 2022-08-14 16:25:25:
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Ques:- You have to draw 3 concentric circles with a line passing through their center without lifting hand.
Recent Answer : Added by rishabh On 2021-05-06 12:40:57:
just will draw the line first and then draw three concentric circles
Ques:- Tom has three boxes with fruits in his barn: one box with apples, one box with pears, and one box with both apples and pears. The boxes have labels that describe the contents, but none of these labels is on the right box. How can Tom, by taking only one piece of fruit from one box, determine what each of the boxes contains?
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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:- 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:- How many integers between 100 and 150, inclusive, cannot be evenly divided by 3 nor 5?
Recent Answer : Added by Kuff On 2021-09-22 16:57:00:
23
Ques:- The largest natural number which exactly divides the product of any four consecutive natural numbers is
A. 6
B. 12
C. 24
D. 120
Recent Answer : Added by narendra On 2022-09-18 09:01:43:
c
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Ques:- Two men and three women working 7 hours a day finish a work in 5 days. Four men and four women working 3 hours a day complete the work in 7 days. The number of days in which only 7 men working 4 hours a day will finish the work is?
Recent Answer : Added by Amit On 2022-08-14 16:45:14:
5
Ques:- 252 can be expressed as a product of primes as
A. 2 x 2 x 2 x 3 x 7
B. 2 x 2 x 3 x 3 x 7
C. 2 x 3 x 3 x 3 x 7
D. 3 x 3 x 3 x 3 x 7
Recent Answer : Added by Ompal Singh On 2022-08-24 17:03:01:
B
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Recent Answer : Added by Reesu Sireesha On 2022-01-08 16:05:31:
Pen
Ques:- Difference between two numbers is 5, six times of the smaller lacks by 6 from the four times of the greater. Find the numbers?
Recent Answer : Added by Rajaprasanna On 2021-06-23 17:55:29:
x=12;y=7
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Ques:- Who made an impact with the New Look after establishinga Paris salon in 1947?
A. Christian Dior
B. Coco Chanel
C. Elsa Schiaparelli
D. Hubert de Givenchy
Recent Answer : Added by H Chris Sparks On 2022-04-02 06:57:48:
A. Christian Dior
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C. 39
3*2+1 = 7
15*2+1 = *31*
31*2+1 = 63
63*2+1 = 127
127*2+1 = 255
255*2+1 = 511