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math..word problem

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The road connecting two mountain villages goes only uphill or downhill. A bus always travels 15 mph uphill and 30 mph downhill. Find the distance between the villages if it takes exactly four hours for the bus to complete a round trip.

  • math..word problem - ,

    time(up) = distance/rate = d/15
    time(down) = d/r = d/30
    Add time up to time down to get
    (d/15)+(d/30) = total time = 4.
    Solve for d.
    [Remember: time(up) + time(down) = 4.0 hr]

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