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Work problem

by roger federer » Sun Mar 07, 2010 7:46 am
Hi, can you help me with this question?

2 boys can mow a lawn in 2 hours and 30 minutes. If they are joined by 3 other boys, how many hours will it take to mow the lawn?

A. 1 H
B. 1 and 1/4 H
C. 1 and 1/2 H
D. 1 and 3/4 H
E. 2 H

Thank you for your Help

Ali
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by firdaus117 » Sun Mar 07, 2010 7:54 am
Work done =2*2.5=5 boys-hours
Now total 5 boys will do same work in 5/5=1 hr
Optin A
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