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    dcjgall's Avatar
    dcjgall Posts: 2, Reputation: 1
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    #1

    Sep 12, 2010, 01:56 PM
    Average speed of a car traveling 40 km/h one way and 60 km/h on return
    A car travels along a road at average speed of 40 km/h, and returns along the same road at an average speed of 60 km/h. What is the average speed for the total trip?
    dcjgall's Avatar
    dcjgall Posts: 2, Reputation: 1
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    #2

    Sep 12, 2010, 01:57 PM

    A car travels along a road at average speed of 40 km/h, and returns along the same road at an average speed of 60 km/h. What is the average speed for the total trip?
    DrBob1's Avatar
    DrBob1 Posts: 425, Reputation: 86
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    #3

    Sep 12, 2010, 04:09 PM
    How long does it take to go X km at 40 kph?
    How long does it take to go X km at 60 kph?
    What is the formula for determining speed?
    You got it!
    krishnakk's Avatar
    krishnakk Posts: 7, Reputation: -1
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    #4

    Sep 13, 2010, 06:11 AM
    average speed of a car travels = 40 km/h
    average speed of a car travels (return)= 60km/h
    total average speed of a car = 40+60/2= 50km/h
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    DrBob1 Posts: 425, Reputation: 86
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    #5

    Sep 13, 2010, 09:51 AM
    Krishnakk
    We are both correct. Lets say trip covers 240 km. At 40 km/hr it takes 6 hours to get there and, at 60 km/hr, 4 hours to return.
    Total time: 10 hours. Total distance 480 km. Average speed= 480km /10 hr = 48 km/hr.
    You have calculated the speed average velocity, I have the distance average velocity. (Or is it the time average velocity?)
    And we think averages are cut and dried!
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