A can do a work in 20 days and B in 50 days. If they work on it together for 5 days, then what fraction of work is left?
A13/20
B1/3
C1/6
D2/9
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Two pipes X and Y can fill a cistern in 21 hours and 24 hours, respectively. The pipes are opened simultaneously and it is found that due to a leakage in the bottom it takes 48 minutes more to fill the cistern. When the cistern is full, in how much time will the leak empty it if no pipe is open during that time?
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