SSC CGL 9 Aug 2015 Shift 1 Paper

Question : 117 of 200

Marks: +1, -0

A tap can empty a tank in 30 minutes. A second tap can empty it in 45 minutes. If both the taps operate simultaneously, how much time is needed to empty the tank ?

30 minutes
18 minutes
14 minutes
15 minutes

Validate

Solution:

Part of tank emptied by both pipes in 1 minute
=

1/{30}+1/{45}

{3+2}/{90}

5/{90}

1/{18}

∴ Required time = 18 minutes

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