MOC 1

Two trains leave the station at the same time, traveling in opposite directions. Train A travels at 80mph, train B at 90mph. How long will it take for them to be 425 miles apart?

For this question, which quantity are you trying to solve?

• distance

• rate

• time

• direction

Two trains leave the station at the same time, traveling in opposite directions. Train A travels at 80mph, train B at 90mph. How long will it take for them to be 425 miles apart?

To begin solving this question, consider D = R x T: How far will Train A travel after t hours?

• 80t

• 80 + t

• 425 + t

• 90t

Two trains leave the station at the same time, traveling in opposite directions. Train A travels at 80mph, train B at 90mph. How long will it take for them to be 425 miles apart?

To begin solving this question, consider D = R x T: How far will Train B travel after t hours?

• 80t

• 80 + t

• 425 + t

• 90t

Two trains leave the station at the same time, traveling in opposite directions. Train A travels at 80mph, train B at 90mph. How long will it take for them to be 425 miles apart?

To solve the problem, notice that there are two distances: the distance Train A traveled, and the distance Train B traveled? What should we do with those distances?

• subtract them

• add them together

• subtract them from 425

• divide them by 425

Two trains leave the station at the same time, traveling in opposite directions. Train A travels at 80mph, train B at 90mph. How long will it take for them to be 425 miles apart?

Express what you planned on doing with the answer to your previous question:

• 90t - 80t

• 90t + 80t

• (90t + 80t) - 425

• (90t + 80t) / 425

Two trains leave the station at the same time, traveling in opposite directions. Train A travels at 80mph, train B at 90mph. How long will it take for them to be 425 miles apart?

Express the equation you will be using to finally answer the question above:

• (90t + 80t) / 425 = 425

• (90t + 80t) - 425 = 425

• 90t - 80t = 425

• 90t + 80t = 425

Two trains leave the station at the same time, traveling in opposite directions. Train A travels at 80mph, train B at 90mph. How long will it take for them to be 425 miles apart?

• t = 425

• t = 2.5

• t = 0.4

• t = 4

John and Philip who live 14 miles apart start at noon to walk toward each other at rates of 3 mph and 4 mph respectively. After how many hours will they meet?

• 14

• 2

• 1.2

• 12

Aaron left L.A. to drive at 55 mph towards Las Vegas. Mike left L.A. an hour after Aaron (also towards Las Vegas), driving at 70 mph. How long will it take Mike to overtake Aaron?

• 3 hours and 15 minutes

• 3 hours and 40 minutes

• 4 hours and 40 minutes

• 3 hours