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Posted by on Sunday, September 19, 2010 at 10:11am.

Richard is driving home to visit his parents125 mi of the trip are on the interstate highway where the speed limit is 65 mph Normally Richard drives at the speed limit, but today he is running late and decides to take his chances by driving at 80 mph.how many minutes will he save

  • physics - , Sunday, September 19, 2010 at 11:20am

    Speed * time = distance
    Time = distance / speed

    Normal time = 125 mi/65 mph
    Time at 80 mph = 125 mi/85 mph

    The difference of the two times is the time saved (in hours)

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