A & B can fill the tank in 15 & 20 hours respectively. They are opened together at 2 PM. After how many hours, A should be stopped if B has to fill the whole tank till 2 AM?
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total time=12 hours
In one hour=1/12
a/15+1/20=1/12
a/15=1/12-1/20
a=2
A STOPPED AFTER 4 PM
In one hour=1/12
a/15+1/20=1/12
a/15=1/12-1/20
a=2
A STOPPED AFTER 4 PM
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