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Two trains 150 m and 100 m long run on parallel tracks in opposite directions at 60 km/h and 40 km/h. Time to cross each other:
A9 sec
B10 sec
C12 sec
D15 sec
Answer & Solution
Correct answer: A. 9 sec
1. Relative speed = (60 + 40) × 5/18 = 100 × 5/18 ≈ 27.78 m/s.
2. Combined length = 150 + 100 = 250 m.
3. Time = 250 / 27.78 ≈ 9 sec.
_Source: jkchrome TSD QB, p.2 — relative speed opposite_
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