RRB NTPC Mains or Stage 2 Model Paper 6 with solutions

Question : 3 of 119

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There are two taps A and B to fill up a water tank. The tank can be filled in 40 min, if both taps are on. The same tank can be filled in 60 min, if tap A alone is on. How much time will tap B alone take, to fill up the same tank?

64 min
80 min
96 min
120 min

Validate

Solution:

(d) Work done by tap B in 1 min

=1/40- 1 /60={3- 2}/ 120 =1/120

Total time taken by the tap B to fill the tank is 120 min.

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