I need help in understanding how to do these problems:(adsbygoogle = window.adsbygoogle || []).push({});

1. Tracy leaves for work at 8 A.M. traveling at 36 mph. Sarah finds that Tracy has forgotten her briefcase, so she leaves at 8:05 chasing after her at 50mph. At what time will Sarah catch Tracy?

2. Two jets leave St. Louis at 2 P.M., one traveling north at 850km/h and the other south at 750km/h. At what time will they be 4000km apart?

3. It takes a train 90min longer to go from Fartmington to Allentown at 60km/h than it does to return at 80km/h. What is the distance between these towns?

These are the "rate x time = distance" problems. How do I figure out what goes where?

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# Homework Help: Motion problems

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