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A cistern can be filled with water by a ...

A cistern can be filled with water by a pipe in 5 hours and It can be emptied by a second pipe in 4 hours. If both the pipes are opened when the cistern is full, the time in which it will be emptied is :

A

9 hours

B

18 hours

C

20 hours

D

20 hours

Text Solution

Verified by Experts

The correct Answer is:
C
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