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Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:

A2(8/11) hours
B3(9/17)hours
C4(1/2) hours
D11(3/17)hours
উত্তর : B.
3(9/17)hours

শেয়ার :

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সম্পর্কিত প্রশ্ন সমূহ

১.

A train 800 meters long is running at a speed of 78 km/hr . If it crosses a tunnel in 1 minute, then the length of the tunnel ( in meters ) is :

A
360
B
500
C
540
D
130
২.

If 4 (A’s capital) = 6 (B’s capital), then out of a profit of TK. 4650, C will receive :

A
900
B
1550
C
2250
D
465
৩.

How many times in a day, are the hands of a cock in straight line but opposite in direction ?

A
22
B
24
C
48
D
20
৪.

Two numbers A and B are such that the sum of 5% of A and 4%of B is two-third of the sum of 6% of A and 8%of B. Find the ratio of A : B .

A

1 : 1

B

3 : 4

C

4 : 3

D

2 : 3

৫.

If the number 5 * 2 is divisible by 6, then * = ?

A
3
B
6
C
7
D
2
৬.

3 pumps , working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day ?

A
10
B
11
C
12
D
9
৭.

Which of the following trains is the fastest ?

A
25m/sec
B
1500m/min
C
90km/hr
D
None of these
৮.

A student was asked to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14, and x. He found the mean to be 12. What should be the number in place of x ?

A
7
B
17
C
31
D
3
৯.

Find the smallest number by which 5808 should be multiplied so that the product becomes a perfect square .

A
3
B
7
C
11
D
2
১০.

The interest on a certain deposit at 4.5% p.a. is TK. 202.50 in one year. How much will the additional interest in one year be on the same deposit at 5% p.a. ?

A
22.5
B
25
C
20.25
D
42.75