Discussion

A train running at 60 km/hr overtakes a man walking at 6 km/hr in the same direction and passes him in 12 seconds. What is the length of the train ?

Answer: B

Correct answer: 180 m

Since both move the same way, the speeds subtract.

\[60 - 6 = 54 \text{ km/hr} = 54 \times \frac{5}{18} = 15 \text{ m/s}\]

Passing a man means covering only the train’s length.

\[L = 15 \times 12 = 180 \text{ m}\]

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