twingirls twingirls
  • 20-04-2017
  • Mathematics
contestada

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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jaxonehenry jaxonehenry
  • 20-04-2017
39 days because 1/2 of 18 =9 and 9 plus 30 = 39
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