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On a highway, a 300-meter long row of cars is traveling at a rate of 60 km/h. When the cars pass a highway patrol station, they slow down to a rate of 40 km/h and continue on at this lower speed. How long will the row of cars be once every car has passed the highway patrol station?

Feb 25, 2020

#2
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300 m = .3 km

when the first car passes and slows to 40 km/hr    the last car is still travelling 60 kmhr

to get to the point wher it slows down will take   .3 km / 60 km/hr = .005 hr

the FIRST car travels  40 km/hr   * .005 hr   during this time = .2 km

so now there is .2 km from the fron car to the back car  ...or the line of cars compresses to 200 m length

Feb 25, 2020

#2
+26007
+2

300 m = .3 km

when the first car passes and slows to 40 km/hr    the last car is still travelling 60 kmhr

to get to the point wher it slows down will take   .3 km / 60 km/hr = .005 hr

the FIRST car travels  40 km/hr   * .005 hr   during this time = .2 km

so now there is .2 km from the fron car to the back car  ...or the line of cars compresses to 200 m length

ElectricPavlov Feb 25, 2020