Question 381977
 Bill runs an average of 12 mph
 Roger runs an average of 10 mph. 
head start of .15 hour. for roger
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make up speed for Bill is 12-10 = 2mph.
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Roger has head start of 0.15 hour
so distance = 0.15 *10= 1.5 miles

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t = d/r
1.5/2
=0.75 hours OR 45 minutes to catch up
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