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Jim Williamson began a 96-mile bicycle trip to build up stamina for a triathlete competition.Unfortunately, his bicycle chain broke, so he finished the trip walking. The whole trip took 6 hours.If Jim walks at a rate of 4 miles per hour and rides at 20 miles per hour, find the amount of time he spent on the bicycle.

  • math -

    time on bike = t hrs
    time walking = 9-t hrs

    distance on bike = 20t miles
    distance walking = 4(9-t) mile

    20t + 4(9-t) = 96

    solve for t

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