Question 539166
Candy and Delvis are riding a bicycle in the same direction.  Candy is traveling at a speed of 9 mph and Delvis at a speed of 13 mph.  In 2 hours what is the distance between them?
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The difference in speed is 4 mi/hr
2*4 = 8 miles.
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You said "riding a bicycle", but I assumed they each had one.