RRB NTPC Mains or Stage 2 Model Paper 1 with solutions

Question : 77 of 120

Marks: +1, -0

A container has two holes. The 1st hole alone empties the container in 15 minutes and 2nd hole alone empties the container in 10 minutes. If water leaks out at a constant rate, how long (in minutes) does it take if both the holes together empty the container?

6
$1/ 6$
$1 /7$
7

Validate

Solution:

(1) Part of the container emptied by both holes in 1 minute
=

1/15+1/10

={2 +3}/30=5/30 =1/6

∴ Required time = 6 minutes

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