RRB NTPC Mains or Stage 2 Model Paper 7 with solutions

Question : 36 of 120

Marks: +1, -0

Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in :

$1 13/17$ hours
$2 8/11$ hours
$3 9/17$ hours
$4 1/2$ hours

Validate

Solution:

=[1/5+1/6-1/12]=17/60.

The tank will be full in

60/17

hrs i.e.,

3 9/17

hrs.

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