Asked by Anonymous

Kathy and Cheryl are walking and running in a fundraiser. Kathy completes the course in 6 hours and Cheryl completes the course in nine hours. Kathy went on average two miles per hour faster than Cheryl. Find Kathy and Cheryl's speed.
Answered by Steve
distance = speed * time, so we have

k = c+2
6k = 9(k-2)
3k = 18
k = 6

check:
6*6 = 4*9
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