Pipes and Cisterns Practice Test 1 with solutions

Question : 31 of 40

Marks: +1, -0

A tank is connected to two pipes. One of these pipes can fill the tank in 15 minutes while the other can empty it in 10 minutes. If the tank is initially 3/5th full and both pipes are simultaneously opened, how much time it will take to fill or empty the tank?

18 minutes
15 minutes
12 minutes
10 minutes

Validate

Solution:

In 1 minute the part emptied when both the pipes are opened =

1/{10}-1/{15}

1/{30}

Hence, in 30 minutes the whole tank will be emptied.
Their

3/5

part will be emptied in

3/5 × 30

= 18 minutes

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