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?

Make a record of how you solved this

4

Step-by-step explanation:

Find the LCM of 12 and 15.

LCM = 60.

Now divide the LCM by the two numbers.

60/12 = 5, 60/15 = 4.

As the sister got an hour head start, subtract one.

5-1=4.

Therefore it will be 4 hours.