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Math Help - speed

  1. #1
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    Question speed

    a cyclist covers 7 1/2 km in 1/2an hour what is the average speed. answer in km per hour. metres pre minute and metres per second
    Last edited by 2hot2domaths; September 9th 2008 at 06:01 AM. Reason: no units
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  2. #2
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    Quote Originally Posted by 2hot2domaths View Post
    a cyclist covers 7 1/2 km in 1/2> Mr F says: Without a unit of time for the 1/2 you're not going to get much help.

    what is the average speed. answer in km per hour. metres pre minute and metres per second
    Use speed = distance/time.
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  3. #3
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    Quote Originally Posted by 2hot2domaths View Post
    a cyclist covers 7 1/2 km in 1/2an hour what is the average speed. answer in km per hour. metres pre minute and metres per second
    Note that 7 1/2 = 15/2.

    Speed = distance/time = \frac{15/2}{1/2} = 15 km/hr.

    15 km/hr = 15000 m in 60 minutes = ...... m/min.

    15 km/hr = 15000 m in 3600 seconds = ...... m/sec.
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    Wink

    thnx but i still dont understand one bit howdu get that
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  5. #5
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    Quote Originally Posted by 2hot2domaths View Post
    thnx but i still dont understand one bit howdu get that
    Which part don't you understand?

    7 12/ km in 1/2 hour is equivalent to 15 km in 1 hour, that is, 15 km/hr.
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