kaplan word problem

bob and alice can finish a job together in 3 hours . if bob can do the job by himself in 5 hours , what percent of the job does alice do ?
1. 20%
2.30%
3.40%
4.50 %
5.60 %

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rn4gmat: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Sun Apr 18, 2010 7:44 pm; Thanked: 3 times

by rn4gmat » Sat May 01, 2010 10:29 am

If Bob does it alone in 5hrs then in 3 hrs he does 60% of work so in 3 hrs Alice will do 40% or work.

Hope it helps.[/spoiler]

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tpr-becky: GMAT Instructor; Posts: 509; Joined: Wed Apr 21, 2010 1:08 pm; Location: Irvine, CA; Thanked: 199 times; Followed by:85 members; GMAT Score:750

by tpr-becky » Sat May 01, 2010 1:38 pm

If Bob does the job alone in 5 hours then his rate is 1/5 per hour - in three hours he does 3/5 of the job leaving Alice with 2/5 of the job to do which is equal to 40%.

Becky
Master GMAT Instructor
The Princeton Review
Irvine, CA

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pradeepkaushal9518: Legendary Member; Posts: 1309; Joined: Wed Mar 17, 2010 11:41 pm; Thanked: 33 times; Followed by:5 members

by pradeepkaushal9518 » Sat May 01, 2010 7:41 pm

thanks tpr for your response.

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