SOLUTION: From a point on a straight road, Bob and Kelsey ride bicycles in the same direction. Bob rides at 12 mph and Kelsey rides at 14 mph. in how many hours will they be 13 miles apart?

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Question 876681: From a point on a straight road, Bob and Kelsey ride bicycles in the same direction. Bob rides at 12 mph and Kelsey rides at 14 mph. in how many hours will they be 13 miles apart?
( Can you show the formula for this type of problem please)
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Formula is for uniform travel rates. RT=D for rate, time, distance.

Bob: 12*t distance
Kelsey: 14*t distance
Their difference is given as 13 miles apart.
14t-12t=13
2t=13
t=13%2F2
t=6%261%2F2 hours