- A25 s
- B30 s
- C90 s
- D45 s
Step-by-Step Solution
Relative speed km/h m/s. Distance m. Time s. (90 s uses the difference 30 km/h.)
Answer: B) 30 s
A 400 m goods train at 30 km/h and a 350 m passenger train at 60 km/h move towards each other on parallel lines. How long do they take to cross?
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