Bill drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 7 hours. When Bill drove home, t

Question

Bill drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 7 hours. When Bill
drove home, there was no traffic and the trip only took 5 hours. If his average rate was 18 miles per hour faster on the
trip home, how far away does Bill live from the mountains?
Do not do any rounding.

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Thu Cúc 4 years 2021-08-05T03:29:38+00:00 1 Answers 20 views 0

Answers ( )

  1. Thunguyet
    0
    2021-08-05T03:30:57+00:00
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    Answer: 315 miles

    Step-by-step explanation:

    let onward speed = x mph, then distance = 7x

    return speed = (x+18) mph, (same) distance = 5(x+18)

    equating the two,

    7x = 5(x+18)

    2x = 90 ==> x = 45 mph

    so distance = 7*45 = 315 miles

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