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pls solve this question

AandB are two taps which can fill a tank individually in 10minutes and 20minutes respectively. However, there is a  leakage at the bottom which can empty initially. hoe much time will both the taps take to fill the tank(leakage is still there)?

1)8min             2)7min                   3)10min                          4)15min
Nov 16, 2014 7:04 PM