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The Johnson family is going on a family trip to New York, 270 miles away. They drive for 3 hours, then stop for lunch, then drive for another 1 1/2 hours before arriving. What is their average speed?

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  1. 22 May, 16:04
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    60 mph

    Step-by-step explanation:

    Their average speed while driving is ...

    speed = distance / time

    = (270 mi) / ((3 + 1.5) h) = 60 mi/h

    The Johnson family averaged 60 mph while driving.

    __

    Their average speed for the trip is unknown, because we don't know how long the lunch stop was.
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