SOLUTION: You can ride a bicycle 15 mph. Your sister rides 12 mph. You give her a one hour head start. In how many hours will you catch up if neither of you stops.

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Question 208473: You can ride a bicycle 15 mph. Your sister rides 12 mph. You give her a one hour head start. In how many hours will you catch up if neither of you stops.
Found 2 solutions by stanbon, Alan3354:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
You can ride a bicycle 15 mph. Your sister rides 12 mph. You give her a one hour head start. In how many hours will you catch up if neither of you stops.
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Your DATA:
rate = 15 mph ; time = x hrs ; distance = rt = 15x miles
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Sister's DATA:
rate = 12 mph ; time = x+1 hrs ; distance = 12(x+1) miles
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Equation:
distance = distance
15x = 12(x+1)
3x = 12
x = 4 hrs
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Cheers,
Stan H.

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Do it the easy way.
In 1 hour, she gets 12 miles away.
You gain on her at 3 mph (15-12).
12/3 = 4 hours.