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How long does a 240 m train at 50 km/h take to overtake a man walking at 5 km/h in the same direction?

Competition practiceProblems on Trains

A17.3 s
B48 s
C19.2 s
D15.7 s

Step-by-Step Solution

Relative speed

= 50 - 5 = 45

km/h

= 12.5

m/s. Time

= \frac{240}{12.5} = 19.2

s. (15.7 s adds the speeds; 17.3 s ignores the man.)

Answer: C) 19.2 s

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