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Two pipes A and B can fill a tank in 3 and 6 min respectively.Starting with A both the pipes are opened alternatively each for 1 min.In what time the tank will be filled?

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  1. fraction of tank filled by A per minute
    = 1/3
    fraction of tank filled by B per minute
    = 1/6
    Fraction of tank filled in first two minutes
    = 1/3+1/6 = 1/2
    Can you take it from here?

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