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10 January, 05:57

Sasha drove from her house to the grocery store in 20 minutes. Her return trip took 15 minutes. If the store is 7 miles from her house, what was Sasha's average speed for the round trip, in miles per hour?

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Answers (2)
  1. 10 January, 06:05
    0
    Total time = 35 minutes

    Total distance = 14 miles

    I would set this up as a proportion

    14/35 = x/60 (60 minutes in an hour)

    Now cross multiply and solve.

    35x = 840

    840/35 = 24 mph
  2. 10 January, 06:14
    0
    Distance = rate * time

    7 miles = rate * 20 minutes

    7/20 = 20r/20

    r = 0.35 mph
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