A tank can be filled with two pipes in 30minutes and 45minutes. when the tank was empty the two pipes a and b were opened.after some time, the first pipe a was closed and the tank was filled in 24minutes. after how much time from the start was the first pipe a closed?
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1/30 mins + 1/45 mins= 1/18mins
then 1 pipe is opened
hence,, 1/18 mins - 1/24 = 1/72....= 72 mins ..
answer
then 1 pipe is opened
hence,, 1/18 mins - 1/24 = 1/72....= 72 mins ..
answer
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