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A pipe can fill a tank in 5 hours and a ...

A pipe can fill a tank in 5 hours and a second pipe can empty it in 4 hours. If both pipes are opened together, then how much time will it take to empty the tank completely?

A

9 hours

B

18 hours

C

20 hours

D

`20(1)/(2)` hours

Text Solution

Verified by Experts

The correct Answer is:
C
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