RRB Group D 17-Sep-2018 Shift 1 Solved Paper

Question : 35 of 100

Marks: +1, -0

Two pipes fill a tank when working individually in 5 and 8 hours, respectively while a third pipe can drain the filled tank in 3.2 hours. If all the three pipes are turned on at the same time when the tank is empty, how long will it take to fill the tank completely?

3 days 8 hr s.
6hrs. 12mins.
9hrs. 48mins
3 days 3 hrs. 36 mins.

Validate

Solution:

LCM of 5,8,3.2= 128Thus,

Tank filled in one hour

=25.6+16-40=1.6

∴

total time required to fill the tank

=\;{128}/{1.6}=80

hours

=3

days

8 {hrs}

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