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A cistern can be filled by two pipes in ...

A cistern can be filled by two pipes in 30 min and 36 min respectively. Both pipes are opened simultaneously to fill a cistern but due to ob struction, `5//6` of first pipe and `9//10` of second pipe is filling the cistern. The obstruction is removed, the cistern get filled in `15(1)/(2)` min from that moment. After how much time the obstruction was removed?

A

1 minutes

B

2 minutes

C

2 1/2 minutes

D

1 1/2 minutes

Text Solution

Verified by Experts

The correct Answer is:
A
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UPKAR PUBLICATION -PIPES AND CISTERNS-QUESTION BANK
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  16. A, B, C are three pipes attached to a cistern. A and B can fill it in ...

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  18. A cistern which could be filled in 9 hours takes one hour more to be f...

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  19. A tap can fill a cistern in 8 hours and another can empty it in 16 hou...

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