Math/Algebra

Farmer Brown drives to town at 36 mph and returns at 48 mph. If his total driving time is 3 and 1/2 hours, how far away is the town?

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asked by Colton
  1. since time = distance/speed,

    d/36 + d/48 = 7/2
    4d/144 + 3d/144 = 504/144
    7d = 504
    d = 72 mi

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    posted by Steve

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