Algebra

On the first part of a trip to Carmel traveling on the​ freeway, Marge averaged 70 mph. On the rest of the​ trip, which was 25 mi longer than the first​ part, she averaged 60mph. Find the total distance to Carmel if the second part of the trip took 30 minutes more than the first part.

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  1. Since distance = speed * time,

    70t + 25 = 60(t + 1/2)
    t = 1/2

    So,
    70mi/hr for 1/2 hr = 35mi
    60mi/hr for 1 hr = 60mi = 35+25 mi

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  2. its 95 mi.

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