Jboyd5727 Jboyd5727

10-05-2018
Mathematics

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An earthquake strikes and an isolated area is without food or water. three crews arrive. one can dispense needed supplies in 4545 hours, a second in 9090 hours, and a third in 6060 hours. how long will it take all three crews working together to dispense food and water?

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flickyabic flickyabic

10-05-2018

It'll take 10 hours for the crew to finish the work.

1 person takes 20h, the second would hake 30h, third 60h.
1/20+1/30+1/60=1/10

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