1. If both the pipes are opened, how many hours will be taken to fill the tank? I. The capacity of the tank is 400 litres. II. The pipe A fills the tank in 4 hours. III. The pipe B fills the tank in 6 hours.

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By: guest on 01 Jun 2017 05.47 pm

II. Part of the tank filled by A in 1 hour = 1 4 III. Part of the tank filled by B in 1 hour = 1 6 (A + B)'s 1 hour's work = 1 + 1 = 5 4 6 12 A and B will fill the tank in 12 hrs = 2 hrs 24 min. 5 So, II and III are needed. Correct answer is (B).