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Jim was driving to an interview 72 mi away. On the first leg of the trop he drove an average of 30 mph through a long construction zone, but was able to drive 60 mph after passing through this area. If driving time for the trip was 1 1/2 hr, how long was he driving in the const. zone?

  • algebra -

    Let the construction zone driving time be T hours. Then, 1.5 - T hours were spent driving at 60 mph. The total distance driven is

    30*T + 60*(1.5 - T) = 72 miles

    90 - 72 = 30 T

    T = 0.600 hours = 36 minutes

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