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March 29, 2017

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A car travels 30 miles in the same time that a car traveling 5 miles per hours faster travels 45 miles. What is the rate of each car?

  • Intermediate Algebra - ,

    speed of slower car --- x
    speed of faster car ---- x+5

    time of slower car to go 30 miles = 30/x
    time of faster car to go 45 miles = 45/(x+5)
    but they are the same, so ---
    45/(x+5) = 30/x
    45x = 30x + 150
    15x = 150
    x = 10

    so the slow car goes 10 mph (very slow) and the faster car goes 15 mph

    check:
    at 10 mph, it takes 30/10 or 3 hrs to got 30 miles.
    at 15 mph , to go 45 miles, takes 45/15 = 3 hrs

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