Two persons

Two persons are walking beside a railway track at respective speeds of 2 and 4 km per hour in the same direction. A train came from behind them and crossed them in 90 and 100 seconds, respectively. Find the length of the train.

Correct answer:

x =  500 m

Step-by-step explanation:

v1=2 km/h m/s=2:3.6  m/s=0.55556 m/s v2=4 km/h m/s=4:3.6  m/s=1.11111 m/s  t1=90 s t2=100 s  v1<v2  x = (vv1) t1 x = (vv2) t2  (vv1) t1=(vv2) t2 (v0.55555555555556) 90=(v1.1111111111111) 100  10v=61.111111  v=1061.11111111=6.11111111  v=9556.111111  x=(vv1) t1=(6.11110.5556) 90=500 m

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