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gmat prep question

This topic has 4 member replies
yvonne12 Master | Next Rank: 500 Posts Default Avatar
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gmat prep question

Post Sun Mar 04, 2007 12:10 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Adam and beth each drove from smallville to crown city by different routes. Adam drove an average speed of 40 mph and completed the trip in 30 minutes. beth route was 5miles longer, and it took her 20 minutes more than adam to complete the trip how many miles per hour was beth 's average speed on this trip?

    answer 30

    please explain

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    jayhawk2001 Community Manager
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    Post Sun Mar 04, 2007 5:44 pm
    Total distance covered by Adam = 40 mph * 30 / 60 min = 20 miles

    Beth's distance = 20 + 5 = 25 miles
    Beth covers this distance in 30 + 20 = 50 minutes

    If 50 minutes => 25 miles, then 60 minutes = 25 / 50 * 60 = 30 mph

    Hence Beth's average speed was 30 miles per hour

    yvonne12 Master | Next Rank: 500 Posts Default Avatar
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    Post Mon Mar 05, 2007 7:57 am
    Thank you, but accoding to the distance formula its

    rate * time = distance why do you divide by sixty minutes?

    also,

    total distance / total time = average speed, why did you divide total distance by 60 min and 50 min.



    Im even more confused..could someone explain this to me. I dont want to catch this question on the real GMAT with different numbers and not know exactly how to attack this question...

    ssiva Junior | Next Rank: 30 Posts Default Avatar
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    Post Mon Mar 05, 2007 10:23 am
    rate * time = distance

    In the problem the rate is givem in mph which is miles per hour and time is in minutes. They have to be brought to a common reference: either hours or minutes.

    yvonne12 Master | Next Rank: 500 Posts Default Avatar
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    Post Mon Mar 05, 2007 4:58 pm
    thank you for clearing that up for me.

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