A train 2

A train 90 meters long is moving at speed 80 km/h overtakes a second train moving at 56 km/h in the same direction and passes completely in 25 1/2 seconds. Compute how long is the second train.

Correct answer:

b =  80 m

Step-by-step explanation:

a=90 m v1=80 km/h m/s=80:3.6  m/s=22.22222 m/s v2=56 km/h m/s=56:3.6  m/s=15.55556 m/s t1=2521=25+21=225 2+1=250+1=251=25.5 s  v=v1v2=92009140=9200140=960=3206.6667 m/s  v = t1a+b  b=v t1a=320 25190 m=80 m



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