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?

4 hours

Step-by-step explanation:

It is given you can ride a bicycle 15 mph. Your sister rides 12 mph. You give her a one hour head start.

Your info:

Speed = 15 mph , let the distance covered be = 'x' miles , time taken to cover the distance,

time = =

Sister's info:

Speed = 12 mph , let the distance covered be = x miles, time taken to cover the distance of 'x' miles,

time =

Equation:  

Sister's time - your time = 1

Multiplying both the sides by 60 we get,

miles

Therefore, your time to catch up:

hours

Therefore, it will take 4 hours to catch up if neither of your stop.

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step-by-step explanation: