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A train passes a pole in 15 seconds and passes a 300 m train coming the other way at 36 km/h in 20 seconds. How long is the first train?

Competition practiceProblems on Trains

A400 m
B200 m
C300 m
D225 m

Step-by-Step Solution

Let speed be

v

m/s:

L = 15 v

and

L + 300 = 20 (v + 10)

. So

15 v + 300 = 20 v + 200

→

v = 20

m/s and

L = 300

m.

Answer: C) 300 m

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