It took Esteban 1 minute and 20 seconds to travel one mile. If he then drives this one mile distance in 55 seconds, how much faster is he driving in miles per hour?

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  1. 60(4/3 min.)*1 mile = 80 mph

    (55/60 min)60 * 1 mile = 55 mph

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  2. the times are 80 seconds and 55 seconds
    1mi/80s * 3600s/hr = 45 mi/hr
    1mi/55s * 3600s/hr = 65.45 mi/hr

    Now just subtract

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