SOLUTION: lynn can mow the lawn in 3 hours using a riding lawn mower. Her brother can mow the same lawn in 7 hours using a push mower. How long would it take them to mow the lawn working t

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Question 32325: lynn can mow the lawn in 3 hours using a riding lawn mower. Her brother can mow the same lawn in 7 hours using a push mower. How long would it take them to mow the lawn working together?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
(3*7)/3+7 OR 21/10 OR 2.1 HOURS TO MOW THE LAWN TOGETHER.