Pipes and Cisterns Practice Test 1 with solutions

Question : 18 of 40

Marks: +1, -0

A and B together can fill a tank in 4 hours, whereas C alone can empty it in 8 hours. Working together, all the three can fill the tank in how much time?

$7 1/{14}$ hours
$6 2/3$ hours
8 hours
6 hours
7 hours

Validate

Solution:

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

1/4

Part of tank emptied by C in one hour =

1/8

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

1/4 - 1/8

1/8

So, together they fill the tank in 8 hours.

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