Three taps P,Q,R can fill a bunker in 3 hrs. After working at it together for 1 hr, R is closed and P,Q can fillthe remaining part in 3 hrs. The number of hrs taken by R alone to fill the bunker.

Three taps P,Q,R can fill a bunker in 3 hrs. After working at it toget

1.	Three taps P,Q,R can fill a bunker in 3 hrs. After working at it together for 1 hr, R is closed and P,Q can fillthe remaining part in 3 hrs. The number of hrs taken by R alone to fill the bunker.
A.	7 hours
B.	8 hours
C.	9 hours
D.	10 hours
Answer» D. 10 hours

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Three taps P,Q,R can fill a bunker in 3 hrs. After working at it together for 1 hr, R is closed and P,Q can fillthe remaining part in 3 hrs. The number of hrs taken by R alone to fill the bunker.

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