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Luke drives the first 300 miles of a trip at 60 miles an hou [#permalink]
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Carcass wrote:
Luke drives the first 300 miles of a trip at 60 miles an hour. How fast does he have to drive, in miles per hour, on the final 200 miles of the trip if the total time of the trip is to equal 7 hours?

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100


Luke drives the first 300 miles of a trip at 60 miles an hour.
travel time = distance/speed
So, travel time = 300/60 = 5 hours

How fast does he have to drive, in miles per hour, on the final 200 miles of the trip if the total time of the trip is to equal 7 hours?
The FIRST part of the trip took 5 hours
So, for the TOTAL travel time to be 7 hours, the SECOND part of the trip must take 2 hours

So, Luke must complete the 200 miles in 2 hours
Speed = distance/time
So, Luke's speed must = 200/2 = 100 miles per hour

Answer: 100
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Re: Luke drives the first 300 miles of a trip at 60 miles an hou [#permalink]
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Re: Luke drives the first 300 miles of a trip at 60 miles an hou [#permalink]
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