Discussion
Two trains of equal length are running on parallel lines in the same direction at 46 km/hr and 36 km/hr. The faster train passes the slower train in 36 seconds. The length of each train is:
Answer: A
Overtaking covers both trains' lengths at the difference of the speeds.
\[ \text{relative speed} = 46 - 36 = 10 \text{ km/hr} = 10 \times \frac{5}{18} = \frac{25}{9} \text{ m/s} \]
\[ 2L = \frac{25}{9} \times 36 = 100 \text{ m} \]
\[ L = 50 \text{ m} \]
The 100 m is the combined length; each train is half of it.
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