_ Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternately, the tank will be full in:$?

_ Three taps A, B and C can fill a tank in 12, 15 and 20 hours respect

1.	_ Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternately, the tank will be full in:$?
A.	6 hours
B.	62/3 hours
C.	7 hours
D.	71/2 hours
Answer» D. 71/2 hours

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_ Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternately, the tank will be full in:$?

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