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Math Help - Please help me quick!!!

  1. #1
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    Please help me quick!!!

    Use conversion factors to solve:
    Distance traveled in feet after 12 seconds at eighty-seven mph

    and please show me how u solved it.
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  2. #2
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    please, i need help and quick!
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  3. #3
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    d = rt, where d = distance, r= rate, t = time

    r = 87 mph -- but you need feet:

    87 mph * 5280 ft/mile = 459360 fph -- but you need seconds:

    459360 fph / 60 min / 60 sec = 127.6 ft/sec is your rate

    d = 127.6 * 12 = 1531.2 ft traveled

    hope this helps
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  4. #4
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    Reply

    Quote Originally Posted by helpmemath View Post
    Use conversion factors to solve:
    Distance traveled in feet after 12 seconds at eighty-seven mph

    and please show me how u solved it.
    time = 12 s
    Since, 1 mile = 1.609 km

    1km = 1000 m
    1 h = 60 min = 60.60 s = 3600 s

    1 feet = 30.48 cm = 0.3048 m

    Speed = 85 m/h = (85)(1.609) km/h= \frac{85\times 1.609 \times 1000\;m}{3600\;s}=37.99 \;m/s

    Distance = speed . time = (37.99)(12)=455.88\;m= \frac{455.88}{0.3048}\;feet=1495.67\;feet
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