The Smiths are moving across the country . Mr. Smith leaves 3 hours before Mrs. Smith . If he averages 55 mph and she averages 65 mph , how many hours will it take Mrs. Smith to catch up to Mr. Smith ?
Answer: It will take Mrs. Smith 16,5 hours to catch up with Mr. Smith.
Explanation:
55 mph x 3 hours = 165 miles
Mr. Smith beat Mrs. Smith by 165 miles.
The speed difference was 65-55 = 10 mph;
165 mph/10 mph = 16,5 hours.
It will take Mrs. Smith 16,5 hours to catch up with Mr. Smith.
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