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Noah, Emma and the Ice Cream Truck

Noah and Emma, track stars with superb hearing, ran as fast as they could to catch up to the ice cream truck in the next town over. They averaged 6 miles per hour, then rested to enjoy their ice cream. They averaged 4 miles per hour over the same distance on the way back. Not counting the time they rested, what was their average speed?

4.8 miles per hour. 5 mph is tempting, but incorrect. Pick any distance, say 12 miles there and 12 miles back. They take two hours to cover the first 12 miles and three hours to cover the return trip. In 5 hours they covered 24 miles which is an overall average of 4.8 miles per hour.

Posted in Brain Teasers

 

2 Comments on "Noah, Emma and the Ice Cream Truck"


George says
May 20, 2020 @ 08:24

One error on the calculation in the answer. 5mph and 12 miles has to take 2.2 hours to get there not 2 hours. (5 miles in an hour, 10 miles in 2 hours, and then 2 more miles to go). The way back indeed takes 3 hours. Hence the difference.


Dan says
May 20, 2020 @ 09:26

They averaged 6 mph on the way there, not 5.


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