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Train A: 72 km/h. Train B: 3/4 × 72 = 54 km/h (same direction). A crosses B in 1 min 26 sec. Length of A = 25/18 × length of B. Find difference between lengths.

1. 70m
2. 85m
3. 110m
4. 60m

Correct answer: 70m

Solution

Relative speed = 18 km/h = 5 m/s. Time = 86s. A+B = 5×86 = 430m. Length A = 25/18×B: 25B/18+B=43B/18=430 → B=180m, A=250m. Difference=250-180=70m.

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