Question 1177602
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brian is walking {{{highlight(cross(alone))}}} <U>ALONG</U> a trail at an average rate of 3 miles per hour. 
carol is bicycling along the same trail in the same direction at an average rate of 9 miles per hour. 
at 12:00 noon brian is 5 miles ahead of carol. if brian and carol maintain these rates, 
at what time will carol overtake brian?
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<pre>
At 12:00, Brian is 5 miles ahead of Carol.


Their relative speed is  9-3 = 6 miles per hour, i.e. Carol decreases the distance between them at the rate of 6 miles per hour,

or 1 miles every 10 minutes.


THEREFORE, Carol will overtake Brian in 50 minutes, at 12:45.
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