Discussion
Two trains of equal length run on parallel tracks in the same direction at 46 km/hr and 36 km/hr. The faster train passes the slower one in 36 seconds. What is the length of each train ?
Answer: B
Correct answer: 50 m
The relative speed is the difference, since they travel the same way.
\[46 - 36 = 10 \text{ km/hr} = 10 \times \frac{5}{18} = \frac{25}{9} \text{ m/s}\]
\[\text{Distance covered} = \frac{25}{9} \times 36 = 100 \text{ m}\]
That 100 m is the combined length of both trains, so each is 50 m long.
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