Pipes and Cisterns Practice Test 1 with solutions

Question : 10 of 40

Marks: +1, -0

Two pipes A and B can fill a tank in 12 minutes and 15 minutes respectively. If both the pipes are opened simultaneously, and the pipe A is closed after 3 minues, then how much more time will it take to fill the tank by pipe B?

8 min 15 sec.
8 min. 5 sec.
7 min. 45 sec.
7 min. 15 sec.

Validate

Solution:

In 3 minutes the part filled by both the pipes = $$3(1/{12}+1/{15}) =

9/{20}

Remaining part = 1 –

9/{20}

{11}/{20}

Time taken by B to fill the remaining part =

{{11}/{20}}/{1/{15}}

{33}/4

minutes = 8 minutes 15 seconds

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