Pipes and Cisterns Practice Test 1 with solutions

Question : 22 of 40

Marks: +1, -0

Three pipes A, B and C are attached to a cistern such that A and B can fill the cistern in 7 and 14 hours respectively, whereas C can empty it in 10 hours. If all the three pipes are opened simultaneously, find the time take by them to fill the cistern.

$8 3/4$ hours
$7 1/{14}$ hours
8 hours
9 hours
$9 1/{11}$ hours

Validate

Solution:

Part of the tank filled by A, B and C in 1 hour
=

1/7 + 1/{14}-1/{10}

{10+5-7}/{70}

8/{70}

So, time taken to fill the tank =

{70}/8

8 3/4

hours.

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