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19 March, 00:16

Robert and Elaine ran around the high school track during gym class. robert ran 1/2 of the way around the track in 5/6 minute. Later in the day, elaina ran 3/4 of the way around the track in 9/10 minute. When they meet after school, Robert claims that he can run father in a minute than elaina. Is he correct or incorrect? Explain your reasoning.

Unpack the problem:

Make a plan:

Solution:

Look back and explain:

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Answers (1)
  1. 19 March, 04:09
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    Answer

    Incorrect

    Explanation

    Unpack the problem:

    Let the distance round the track to be X.

    Speed is the ratio of distance to time.

    Robert run a distance of (1/2) x

    Elaine run a distance of (3/4) x

    Make a plan:

    Finding the speed of each.

    Compare their speeds to determine who ran faster than who.

    Solution:

    Robert's speed = (1/2) x / (5/6)

    =1/2*6/5x

    = (3/5) x

    = 0.6x

    Elaine's speed = (3/4) x / (9/10)

    = (3/4) * (10/9) x

    = (5/6) x

    = 0.83333x

    Elaine ran faster than Robert.

    Look back and explain:

    0.83333x > 0.6x

    Elaine's speed is higher than Robert's speed.

    This shows that Elaine ran faster than Robert.
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