crew a can tunnel through a mountain in 30 days. if crew B starts from the other side at the same time, the tunnel can be completed in 18 days. how long would it take crew B working alone?

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asked Aug 25, 2018 151k views

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crew a can tunnel through a mountain in 30 days. if crew B starts from the other side at the same time, the tunnel can be completed in 18 days. how long would it take crew B working alone?

Mathematics
high-school

Shahriar Nasim Nafi asked

by Shahriar Nasim Nafi

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39 days because 1/2 of 18 =9 and 9 plus 30 = 39

Zahra Badri answered Aug 30, 2018

by Zahra Badri

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