Pipes and Cisterns Practice Test 2 with solutions

Question : 39 of 40

Marks: +1, -0

A water tank is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are opened, how long will it take to empty or fill the tank completely?

6 min. to fill
6 min. to empty
9 min. to fill
9 min. to empty

Validate

Solution:

In 1 minute the part emptied by both the pipes =

1/6 - 1/{10}

1/{15}

Time taken by both the pipes to empty

2/5

tan =

{2/5}/{1/{15}}

= 6 minutes.

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