math, algegra

A Freight train is traveling 30 miles per hour. An automobile starts out from the same place 1 hour later and overtakes the train in 3 hours. What was the rate of the automobile?

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  1. the train went for 4 hours at 30 mph, so it went 120 miles
    the car also went 120 miles but only took 3 hours , let its rate be x mph

    so solve:
    3x = 120

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