Question
Pipe A can fill 50% of a tank in 4 hours and pipe B can
completely fill the same tank in 12 hours. If both the pipes are opened at the same time, then in how much time will the empty tank be completely filled?Solution
Pipe A can fill 50% of a tank in 4 hours So, full in 8 hours Now, LCM of 12 and 8 is 24 i.e total work Efficiency of A and B = 24/8 = 3, 24/12 = 2 Effective efficiency = 5 Time = 24/5 = 4 (4/5)hours 4/5 hours = 48 minutes
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