Two automobiles are 150 kilometers apart and traveling toward each other. One automobile is moving at 60km/h and the other is moving at 40km/h mph. In how many hours will they meet?
Correct answer: D. 1.5
- A. 2.5
- B. 2.0
- C. 1.75
- D. 1.5
- E. 1.25
Explanation
Because the automobiles move toward each other, their closing speed is 60 km/h + 40 km/h = 100 km/h. The meeting time is distance divided by closing speed: 150 km / 100 km/h = 1.5 h, while 2.5 h results from incorrectly using only the 60 km/h speed.
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About Displacement and Velocity
Displacement is the directed change in position, while velocity is the rate of change of displacement and includes both magnitude and direction. The topic connects position-time and velocity-time graphs with average and instantaneous values, and distinguishes displacement from distance and velocity from speed.
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