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?
Luke drives the first 300 miles of a trip at 60 miles an hour.travel time = distance/speedSo, travel time = 300/60 =
5 hoursHow 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 hoursSo, for the TOTAL travel time to be 7 hours, the SECOND part of the trip must take
2 hoursSo, Luke must complete the 200 miles in
2 hoursSpeed = distance/timeSo, Luke's speed must = 200/
2 = 100 miles per hour
Answer: 100
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