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?

Algebra ->  Human-and-algebraic-language -> 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?      Log On


   

Question 761799: 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?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
12x=15(x-1)

12x=15x-15

12x-15x=-15

-3x=-15

x=(-15)/(-3)

x=5

So 5 hours total will pass by, but for you, 5-1 = 4 hours pass by (since she got the 1 hr head start). So it will take you 4 hours to catch up to her (after you start riding).