Help needed with this uniform motion applicationproblem: A car traveling at 80 k

Question

Help needed with this uniform motion applicationproblem: A car traveling at 80 kilometers per hour is passed by asecond car going in the same direction at a constant speed. After30 seconds, the two cars are 500 meters apart. Find the speedof the second car. Help needed with this uniform motion applicationproblem: A car traveling at 80 kilometers per hour is passed by asecond car going in the same direction at a constant speed. After30 seconds, the two cars are 500 meters apart. Find the speedof the second car.

Explanation / Answer

A car traveling at 80 kilometers per hour is passed by asecond car going in the same direction at a constant speed. After30 seconds, the two cars are 500 meters apart. Find the speedof the second car.

the first car is going 80
the second car is going 80+x
when they pass they are at the same point 30 seconds later they are500 meters apart or .5 kilometers
using Distance=rate*time  D=rt             30 sec is .0083 of anhour          3600 secper hour   30/3600=.0083

after 30 seconds
the first car has traveled
80*.0083
the second car traveled
80*.0083+.5=1.164 kilometers
to find time
D=rt
1.164=r*.0083
1.164/.0083=r
140 kilometers per hour =r

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