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Math Help - Physics...

  1. #1
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    Physics...

    Looking to see if I have the right answer...

    An airplane travels 2100 km at a speed of 800 km/h, and then encounters a tailwind that boosts its speed to 1000 km/h for the next 1800 km. What was the total time for the trip? What was the average speed of the plane for this trip?

    Total Time?

    (2100 km)/ (800 km/h) = 2.62
    (1800 km)/ (1000 km/h) = 1.8

    2.62+1.8= 4.42 (4 hours 42 Minutes)

    What was the average speed?

    AS = (Total Distance)/(Elapsed time)
    AS = (2100+1800)/ (4.42)
    AS = (3900)/(4.42)
    Average Speed = 882.35

    I appreciate the help,

    qbkr21
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  2. #2
    Newbie DavePercy's Avatar
    Joined
    Feb 2008
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    Your decimal answers are right, but 4.42 hr isn't 4 hr 42 min; it's 4hr + .42hr = 4 hr + .42(60min) = 4hr + 25.2min.
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