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4.8 Rate-Time-Distance Problems

4.8 Rate-Time-Distance Problems. Objective : To solve some word problems involving uniform motion.

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4.8 Rate-Time-Distance Problems

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  1. 4.8 Rate-Time-Distance Problems • Objective: To solve some word problems involving uniform motion. • Warm – up: Motion in the Opposite Direction.Mary Beth and Michael leave school traveling in opposite directions. Michael is walking and Mary Beth is biking, averaging 6 km/h more than Michael. If they are 18 km apart after 1.5 h, what is the rate of each?

  2. 4.8 Rate-Time-Distance Problems Motion in the Same Direction. Carla begins biking south at 20 km/h at noon. Dean leaves from the same point 15 min later to catch up with her. If Dean bikes at 24 km/h, how long will it take him to catch up with Carla? • A helicopter leaves Central Airport and flies north at 180 mi/h. Twenty minutes later a plane leaves the airport and follows the helicopter at 330 mi/h. How long does it take the plane to overtake the helicopter?

  3. 4.8 Rate-Time-Distance Problems Motion of a Round Trip. Mark drove his car to the garage at 48 km/h and then walked back home at 8 km/h. The drive took 10 min less than the walk home. How far did Mark walk and for how long? • A ski lift carried Maria up a slope at the rate of 6 km/h, and she skied back down parallel to the lift at 34 km/h. The round trip took 30 min. How far did she ski and for how long?

  4. 4.8 Rate-Time-Distance Problems • Homework: • Pg. 170Written Exercises #2, 4, 6, 9, 3, 8, 10

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