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7 February, 08:53

Yesterday, noah ran 2 1/2 miles in 3/5 of an hour. Emily ran 3 3/4 miles in 5/6 hour. Anna ran 3 1/3 in 3/5 hour. How fast, in miles per hour l, did each person run? who ran the fastest?

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  1. 7 February, 10:49
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    To calculate the speed of each one we proceed as follows:

    speed=distance/time

    a] Noah's speed:

    distance=2.5 miles

    time=3/5 hours

    speed = (2 1/2) / (3/5)

    = (5/2) / (3/5)

    =5/2*5/3

    =25/6

    =4 1/6 mi/hr

    Emily's speed

    distance=3 3/4 miles

    time=5/6 hour

    thus

    speed = (3 3/4) / (5/6)

    =15/4) / (5/6)

    =15/4*6/5

    =4 1/2 mi/hr

    Anna's speed:

    distance=3 1/3 miles

    time=3/5

    speed = (3 1/3) / (3/5

    = (10/3) / (3/5)

    =10/3*5/3

    =5 5/9 mi/hr

    Anna was the fastest
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