A tap can fill the cistern in 8 hours and another can empty it in I6 hours.If both the taps are opened simultaneously,the time(in hours) to fill the tank is_____________.

A tap can fill the cistern in 8 hours and another can empty it in I

1.	A tap can fill the cistern in 8 hours and another can empty it in I6 hours.If both the taps are opened simultaneously,the time(in hours) to fill the tank is_____________.
A.	16hrs
B.	20hrs
C.	10hrs
D.	12hrs
Answer» B. 20hrs

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A tap can fill the cistern in 8 hours and another can empty it in I6 hours.If both the taps are opened simultaneously,the time(in hours) to fill the tank is_____________.

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