Two trains X and Y are travelling in the same direction at 100 km/h and 60 km/h respectively. Train X crosses a man in train Y in 9 seconds. What is the length of train X?
- A. 80 m
- B. 100 m ✓
- C. 120 m
- D. 150 m
Correct Answer: B. 100 m
Explanation
Relative speed = 100 - 60 = 40 km/h = 40 \times \frac{5}{18} = \frac{100}{9} m/s. The length of train X equals the relative distance covered, which is \frac{100}{9} \times 9 = 100 m.
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