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Emilio left Sunshine Road at 8:30 A.M. and arrived at Summer Lane at 1:30 P.M. His average speed for the whole journey was 60 km per hour. For the first 60% of the trip, he drove at an average speed at of 90 km per hour. For the next 25% of the remaining trip, his average speed was 60 km per hour. Find his average speed for the remaining part of the trip.

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  1. The average speed for the whole trip was 60 km/h
    the total time is 5 hours, so the total distance = 300 km
    time for first leg = .6(300)/90 = 2 hours
    time for 2nd leg = .25(.4)(300)/60 = .5 hours
    leaving him with 2.5 hours for the last part
    distance he still has to go = 300 - .6(300) - .25(.4)(300) = 90 km

    so speed for last leg = 90/2.5 = 36 km/h

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  2. plz show all of your work

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  3. thank you

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