How much time elapses before the two cars collide? Two cars, A and B, - ProProfs Discuss
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How much time elapses before the two cars collide? Two cars, A and B, are 400 meters apart. Car A travels due east at 30 meters per second on a collision course with car B which travels due west at 20 meters per second.
A. 2s
B. 8.0s
C. 20s
D. 40s

Asked by Priya_hemika, Last updated: Jan 17, 2020

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3 Answers

H. Barnes

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H. Barnes, Unemployed, Barnes, Atlanta

Answered Feb 26, 2019

The correct answer to this question is B. If two cars are 400 meters apart and a collision occurs while one is traveling east at 30 meters per second and the other is traveling west at 20 meters per second, you would need to solve for x to find out how much time elapsed before the two cars collided.

To do this, you would multiply one speed of 30 by the time of x to the other speed of 20 to the time of x to equal the distance of 400 meters. When you add the 30x and the 20x, you get 50x. You would then need to divide 400 by 50 to get x which equals 8 seconds.

 

John Adney

John Adney

Answered Jul 17, 2017

30x+20x=400 where x equals the number of seconds and 400 is the amount both cars need to travel to collide (Since they are apart 400 meters)

50x=400

x=8, therefore, 8 seconds will pass before the two cars collide

 

yarikluchko

Yarikluchko

Answered Jul 17, 2017

30x+20x=400 where x equals the number of seconds and 400 is the amount both cars need to travel to collide (Since they are apart 400 meters)

50x=400

x=8, therefore, 8 seconds will pass before the two cars collide

 

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