A tire has 3 punctures. The first puncture alone could expel the air of that tire in 7 minutes, second alone in 14 minutes and third alone in 28 minutes. If the air exits at a constant rate, then how much time (in minutes) will it take for all the punctures to expel the entire air from the tire?

A tire has 3 punctures. The first puncture alone could expel the air o

1.	A tire has 3 punctures. The first puncture alone could expel the air of that tire in 7 minutes, second alone in 14 minutes and third alone in 28 minutes. If the air exits at a constant rate, then how much time (in minutes) will it take for all the punctures to expel the entire air from the tire?
A.	5
B.	7
C.	4
D.	6
Answer» D. 6

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A tire has 3 punctures. The first puncture alone could expel the air of that tire in 7 minutes, second alone in 14 minutes and third alone in 28 minutes. If the air exits at a constant rate, then how much time (in minutes) will it take for all the punctures to expel the entire air from the tire?

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