Math CentralQuandaries & Queries


Question from brenda, a parent:

mary drove her car at 55 mi/h for 4 h. Use the formula d = rt (where d is the distance traveled, r is the rate of travel and t is the time traveled) to determine how far mary traveled.

Hi Brenda,

Bob drives faster than Mary, he drove at 65 miles per hour but only for 3 hours. So in every hour he went 65 miles and hence in 3 hours he went 65 × 3 = 195 miles. You can express what I just did with a formula

distance = rate × time or d = rt

Try this with Mary's drive.


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