SOLUTION: David can clear a lot in 1.5 hours. His partner can do the same job in 3.5 hours. How long will it take them to clear the lot working together?

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Question 1103718: David can clear a lot in 1.5 hours. His partner can do the same job in 3.5 hours. How long will it take them to clear the lot working together?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Rate x Time = Output
.
.
.
R%5BD%5D%2A%283%2F2%29=1
R%5BD%5D=2%2F3
.
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R%5BP%5D%2A%287%2F2%29=1
R%5BP%5D=2%2F7
So then,
%28R%5BD%5D%2BR%5BP%5D%29%2AT=1
%282%2F3%2B2%2F7%29%2AT=1
%2814%2F21%2B6%2F21%29%2AT=1
%2820%2F21%29%2AT=1
T=21%2F20
T=1%261%2F20
1 hr, 3 minutes.