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March 28, 2017

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For the first 1 1/2 hours of a 91km journey the average speed was 30km/h.If the average speed for the reminder of the journey was 23km/h, calculate the average speed for the entire journey.

  • Mathematics - ,

    Distance travelled for 1.5 hours at 30
    = 1.5*30 km
    = 45 km
    Remainder of journey
    = 91-45
    = 46 km
    Time required at 23 km/hr
    = 46/23
    = 2 hours
    Total distance = 91 km
    total time = 1.5 + 2 = 3.5 hours
    Average speed
    = 91/3.5 km/hr
    =26 km/hr

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