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Thread: distance = Speed * time

  1. #1
    Expert Member
    Join Date
    Jun 2006
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    410

    distance = Speed * time

    A motorist covers 177.5 km in 2 hours. On the open road he averages 105 km/h
    and 40 km/h in urban areas. How many minutes did he take to pass through the
    urban areas?

    -- James.


  2. #2
    Expert Member
    Join Date
    Jun 2006
    Answers
    410

    Re: distance = Speed * time - Answer

    Let us assume that the motorist took x hours to cross urban areas. Therefore he travelled for 2-x hours on open road.

    Therefore (x *40 + (2-x)*105) = 177.5
    => 40x+210-105x = 177.5
    => 65x = 32.5
    => x = 0.5 hours = 30 mins

    The motorist took 30 mins to pass through urban areas.

    -- James


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