1.

A tank can be filled by two taps X and Y in 5 hrs and 10 hrs respectively while another tap Z empties the tank in 20 hrs. In how many hours can be tank be filled, if all 3 taps are kept open?1). 52). 43). 74). 8

Answer»

EFFICIENCY of X = 1/5

Efficiency of Y = 1/10

Efficiency of Z = 1/20

⇒ Total efficiency of X, Y and Z = (1/5) + (1/10) - (1/20) = 1/4

∴ Total time TAKEN is 4 hours


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