Question 234697
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After the boy has been gone for 1 hour at 8 miles per hour, he will be 8 miles from home.  If Dad catches him in 15 minutes, then he will have traveled another 15 minutes at 8 miles per hour.  Since 15 minutes is one-quarter hour, he will have gone another 8 divided by 4 = 2 miles.  The 8 miles the boy traveled in the first hour plus the 2 miles he traveled in the following 15 minutes makes a total of 10 miles -- and that is the distance Dad has to travel in that 15 minutes.  10 miles per 15 minutes times 4/4 = 40 miles per 60 minutes = 40 miles per hour.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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