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Two boys can mow a lawn in 2 hours and 30 minutes If they are joined by ... ...

Two boys can mow a lawn in 2 hours and 30 minutes If they are joined by three other boys, how many hours will it take to mow the lawn?
(A)    1 hr.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Nova Math - Problem Set R: Ratio & Proportion

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Two boys can mow a lawn in 2 hours and 30 minutes If they are joined by ... ... 
Posted: 01/19/2014 19:20
Could you please explain with more detail?
Contributor
 
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Two boys can mow a lawn in 2 hours and 30 minutes If they are joined by ... ... 
Posted: 01/19/2014 20:44
1 lawn / (2 boys x 2.5 hours) = 1 lawn / (5 boys x n hours)

Solve for n.
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