SOLUTION: A man can dig a ditch in 3 hours and his daughter can dig the same size ditch in 5 hours. Working together, how long will it take them to dig the ditch?
I put 1/3 and 1/5 and got
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I put 1/3 and 1/5 and got
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Question 1052184: A man can dig a ditch in 3 hours and his daughter can dig the same size ditch in 5 hours. Working together, how long will it take them to dig the ditch?
I put 1/3 and 1/5 and got the LCD of 15. Then I figure out 5/15-3/15 but was not sure if the answer would be just 2 hours or 2 hours and 15 minutes?
You can put this solution on YOUR website! A man can dig a ditch in 3 hours and his daughter can dig the same size ditch in 5 hours. Working together, how long will it take them to dig the ditch?
I put 1/3 and 1/5 and got the LCD of 15. Then I figure out 5/15-3/15 but was not sure if the answer would be just 2 hours or 2 hours and 15 minutes?
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5/15-3/15 = 2/15 = 8 minutes.
That's optimistic.
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The man digs 1/3 per hour.
Daughter digs 1/5 per hour.
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1/3 + 1/5 = 8/15 ditch per hour
--> 15/8 hours per ditch
