SOLUTION: If it takes 8 men 9 hours to dig a hole in 20 meters deep,how long would it take 10 men to dig a hole if they work at the same rate?

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Question 828494: If it takes 8 men 9 hours to dig a hole in 20 meters deep,how long would it take 10 men to dig a hole if they work at the same rate?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
If it takes 8 men 9 hours to dig a hole in 20 meters deep,
Find the number of man-hours required to do the job
8 * 9 = 72 man-hrs
:
how long would it take 10 men to dig a hole if they work at the same rate?
let h = no. of hrs for 10 men do the same job
10h = 72
h = 7.2 hrs