A water tank can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tankfrom empty state if B is used for half the time , and A B fill it together for the other half?

A water tank can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tankfrom empty state if B is used for half the time , and A B fill it together for the other half? Correct Answer 30 min

Part filled by (A + B) in 1 minute = (1/60 + 1/40) = 1/24 Suppose , the tank is filled in x minutes Then x/2 ( 1/24 + 1/40) = 1 x/2 × 1/15 = 1 x = 30 min
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