1.

Pipes A and B can fill a tank in 5 hours and 20 hours respectively. If both pipes are opened then, how much time (in hours) it will take to fill the tank?1). 4.52). 33). 3.54). 4

Answer»

Pipe A can FILL the tank in 5 hours.

⇒ Pipe A’s 1 - hour WORK = 1/5

Pipe B can fill the tank in 20 hours.

⇒ Pipe B’s 1 - hour work = 1/20

When they work TOGETHER, the work will complete in,

(A + B) = (1/5 + 1/20) = (4 + 1)/20 = 5/20 = 1/4

(A + B) can complete the whole work in 4 days



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