RRB RPF RPSF SI and CONS Model Papers 5 with solutions

Question : 95 of 119

Marks: +1, -0

A water tank can be filled by a tap in 30 minutes and by another tap in 60 minutes. If both the taps are kept open for 5 minutes and then the first tap is closed, how much more time is needed to fill the tank?

20 minutes
25 minutes
30 minutes
45 minutes

Validate

Solution:

(4) Part of the water tank filled in 5 minutes by both taps

=5 ( {1}/{30}+ {1}/{60} )= {1}/{4}

So, the remaining part

=1- {1}/{4}= {3}/{4}

Time taken by second tap to fill remaining part

= {3}/{4}× 60=45

minutes

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