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Salem and Vernon ville are 168 miles apart. A car leaves Salem traveling towards Vernonville, and another car leaves Vernonville at the same time, traveling towards Salem. The car leaving Salem averages 10 miles per hour more than the other and they meet after 1 hour and 36 minutes. What are the average speeds of the car?

  • Algebraic -

    1 hr 36' = 1.6 hours
    in that time, the cars cover 168 miles
    If the slower car has speed s,

    s+(s+10) = 168/1.6 = 105
    2s = 95
    s = 47.5

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