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15 November, 07:50

Mario can run 6 miles in 50 minutes. At this rate how many miles can he run in 30 minutes?

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Answers (2)
  1. 15 November, 10:33
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    Comment

    You are not always obligated to change minutes to hours, especially in a question like this one where times are both given in minutes, and there are only 2 times given.

    Givens

    d1 = 6 miles

    t1 = 50 minutes

    r = ?

    Equation and solution.

    r = d1/t1

    r = 6 / 50

    r = 0.12 miles / minute. The rate is the same for the next part.

    Part 2

    Givens

    t2 = 30 minutes

    r = 0.12 miles/minute

    d2 = ?

    d = r * t2

    d = 0.12 miles/minute * 30 minutes

    d = 3.6 miles Note the minutes cancel.

    Comment.

    There is a quicker way of doing this. The two rates are the same, so you could create a proportion.

    d1/t1 = d2/t2

    d1 = 6 miles

    t1 = 50 minutes

    d2 = ?

    t2 = 30 minutes

    6/50 = d2/30 Cross miltiply

    180 = 50 * d2 Divide by 50

    180/50 = d2

    3.6 = d2

    Answer 3.6 miles
  2. 15 November, 11:49
    0
    6/50 = x/30

    180=50x

    3.6=x

    3.6 miles
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