If three taps are opened together, a tank is filled in 12 hrs. One of the taps can fill it in 10 hrs and another in 15 hrs. How does the third tap work?

If three taps are opened together, a tank is filled in 12 hrs. One

1.	If three taps are opened together, a tank is filled in 12 hrs. One of the taps can fill it in 10 hrs and another in 15 hrs. How does the third tap work?
A.	12hrs
B.	5hrs
C.	8hrs
D.	10hrs
Answer» B. 5hrs

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If three taps are opened together, a tank is filled in 12 hrs. One of the taps can fill it in 10 hrs and another in 15 hrs. How does the third tap work?

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