RRB NTPC Prelims Model Paper 2 with solutions

Question : 54 of 101

Marks: +1, -0

A leakage can empty a tank in 8 hr. A pipe is connected which can fill the tank in 4 hr. How many hours are needed to fill the tank if both pipes are working together?

4 hr
6 hr
7 hr
8 hr

Validate

Solution:

(4) In 1 hr,
The pipe can fill

1/4

of the tank
The leakage can empty

1/8

of the tank
Together they can fill

1 /4-1/8= 1/8

of the tank in one hour
So, required time

=1/1/8= 8 hr

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