Driving in the left lane of a highway at 30m/s, you observe a car 300m ahead of you in the right lane going at 20m/s in the same direction. Assuming that both cars maintain a constant velocity, how long before you catch up?

+4 votes


1. 30s
2. 25s
3. 20s
4. 15s
5. 6s


asked Dec 15, 2012 in Physics by Ytwsa ~Expert~ (1,092 points)

1 Answer

+1 vote
You can solve this by setting up an equation as follows:

t*30 = t*20 +300

where t = time in seconds, and 30 and 20 represent the speeds of the cars, and 300 is the distance that separates the car at time = 0

Solving for t we get:

t = 30s

Therefore choice 1 is correct.
answered Dec 15, 2012 by Panda ~Expert~ (1,557 points)

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