Ques:- A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 mph, the speed of the stream is:
Recent Answer : Added by Sanjeevnaidu On 2022-09-02 17:04:42:
Let speed of stream be v mph
Then,
36/(10-v) = 1.5hr + 36/(10+v)
On solving, we get speed of stream as v = 2mph.
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Ques:- On a certain island,5% of the inhabitants are one-legged.The total population is 10,000.If half of the two legged persons go barefoot,what is the least number of shoes needed in the island?
Recent Answer : Added by DK BOSS On 2021-07-16 09:53:22:
10000
one-legged =5% of 10000=500
remaining=10000-500=9500
barefooted=9500/2=4750
remaining people= 9500-4750=4750
hence required number of shoes= 4750*2+500*1=100005% of 10000 = 500 one legged
9500 / 2 = 4750 bare foot
minium no of shoes = 4750*2 + 500*1 = 10000
Ques:- Find the odd man out:
13. 253, 136, 352, 460, 324, 631, 244
A. 631
B. 352
C. 324
D. 136
Recent Answer : Added by yasir khan On 2022-01-24 05:52:03:
324
the sum of all = 10
Accept
324 = 3+2+4 =/=10 (NOT EQUAL TO 10)
Ques:- Tis known in refined company, that choosing K things out of N can be done in ways as many as choosing N minus K from N: I pick K, you the remaining. This simply states the binomial coefficient identity . Find though a cooler bijection, where you show a knack uncanny, of making your choices contain all K of mine.For pedantry let K be no more than half N.
Ques:- A bag contains 7 green and 8 white balls. If two balls are drawn simultaneously, the probability that both are of the same colour is -.
Recent Answer : Added by Jordan On 2022-08-14 16:45:51:
I agree with @TUMWINE PETER
Ques:- Communication system
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Ques:- A train moves fast a telegraph post and a bridge 264 m long in 8 sec and 20 sec respectively. What is the speed of the train?
Recent Answer : Added by Laksith Ekanayake On 2022-08-14 16:33:51:
237.6 Kmh
Ques:- In an exam, Amar scored 64 percent, Bhavan scored 36 percent and Chetan 44 percent. The maximum score awarded in the exam is 800. Find the average mark scored by all the three boys?
Recent Answer : Added by Atif On 2022-12-05 16:13:45:
600
Ques:- The speed of a train is 90 kmph. What is the distance covered by it in 10 minutes?
Recent Answer : Added by Sahana HP On 2021-10-12 12:52:44:
Distance =speed ×time
Speed =90kmph
90km take 60min time to reach
In 10min the distance covered =?
D=90×10/60
900/60
D=15
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Ques:- Two trains are moving in the same directions at 65 km/hr and 45 km/hr. The faster train crosses a man in slower train in 18 seconds. The length of the faster train is
A. 100 m
B. 120 m
C. 145 m
D. 180 m
Recent Answer : Added by Prashanth On 2022-11-10 16:31:44:
Relative speed =65-45km/hr
Relative speed=20km/hr
Convert to m/s
S=20*5/18
S=5.555
Length of the faster train =5.55555*18seconds
=100meters
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Ques:- A certain type of mixture is prepared by mixing brand A at Rs.9 a kg. with brand B at Rs.4 a kg. If the mixture is worth Rs.7 a kg., how many kgs. of brand A are needed to make 40kgs. of the mixture?
Recent Answer : Added by Admin On 2022-09-29 17:39:56:
Answer:
24
Step-by-step explanation:
A + B = 40.
And at Rs 7 a kg for 40 kg, you want a total of Rs.280.
So the second equation is 9A + 4B = 280
From the first equation: B = 40 – A
and sub into the second equation:
9A + 4(40-A) = 280
9A + 160 – 4A = 280
5A = 120
A = 24.
And you should check: B should equal 40-24 = 16. Check with the final equation: 9*24 + 4*16 = 216 + 64 = 280. So it works.
Your answer, of course, is A = 24
Ques:- In a grass field, If there are 40 cows, they could eat for 40 days. If there are 30 cows, they could eat for 60 days. Than if 20 cows, How much day they could eat?
A. 60
B. 80
C. 55
D. 50
Recent Answer : Added by Admin On 2020-05-17 12:05:48:
40
40
30
60
– 10 cows
+ 20 days
if 40 cows can eat for forty days
then 20 cows can eat for 80 days
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Ques:- A man whose speed is 4.5 kmph in still water rows to a certain upstream point and back to the starting point in a river which flows at 1.5 kmph, find his average speed for the total journey?
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Ques:- A cylinder is 6 cms in diameter and 6 cms in height. If spheres of the same size are made from the material obtained, what is the diameter of each sphere?(a) 5 cms(b) 2 cms(c) 3 cms(d) 4 cms
Recent Answer : Added by Saeed On 2022-08-14 16:43:27:
2cm b)
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Ques:- Which is the largest?
A. (125)^15
B. (5)^125
C. (625)^20
D. (25)^10
Recent Answer : Added by Admin On 2020-05-17 12:02:23:
125^15 would be 5^18
625^20 would be 5^24
25^10 would yield 5^12
so
The answer is b) i.e. 5^125
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Ques:- Number Series 10,2,8,2,6,2,?
Recent Answer : Added by Nagarjuna On 2021-04-22 15:45:02:
4
Ques:- A motorcyclist goes from Bombay to Pune, a distance of 192 kms at an average of 32 kmph speed. Another man starts from Bombay by car 2 ½ hours after the first, and reaches Pune ½ hour earlier. What is the ratio of the speed of the motorcycle and the car?
Let speed of stream be v mph
Then,
36/(10-v) = 1.5hr + 36/(10+v)
On solving, we get speed of stream as v = 2mph.