Three neighborhood children, individually, can mow Mr. Phelps's lawn in 1.5, 2, and 3 hours, respectively. What is the fastest the job can be completed by two of the children working together at their respective rates?
a) 6/7 hours
b) 3/2 hours
c) 7/4 hours
d) 7/2 hours
e) 5 hours
Please assist with above problem.
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Three neighborhood children, individually, can mow Mr. Phelp
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alanforde800Maximus
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Hi alanforde800Maximus,
What is the source of this question? I ask because you can answer it with 10 seconds of logical thinking and no actual work - and you're not likely to see questions designed in that way on the GMAT.
Since the individual times it takes to mow the lawn are 1.5 hours, 2 hours and 3 hours, the fastest child can mow the lawn by himself in 1.5 hours. If he has help, then it would take LESS time than that...
Final Answer: A
GMAT assassins aren't born, they're made,
Rich
What is the source of this question? I ask because you can answer it with 10 seconds of logical thinking and no actual work - and you're not likely to see questions designed in that way on the GMAT.
Since the individual times it takes to mow the lawn are 1.5 hours, 2 hours and 3 hours, the fastest child can mow the lawn by himself in 1.5 hours. If he has help, then it would take LESS time than that...
Final Answer: A
GMAT assassins aren't born, they're made,
Rich
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alanforde800Maximus
- Master | Next Rank: 500 Posts
- Posts: 187
- Joined: Tue Sep 13, 2016 12:46 am
Hello Rich,
The source is Veritas Prep Material. I have attached the pic of question from the manual.
The source is Veritas Prep Material. I have attached the pic of question from the manual.
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