- A42
- B48
- C54
- D132
Step-by-Step Solution
Total length = 137 + 163 = 300 m covered in 12 , so the relative speed = 25 m/ km/h. Moving towards each other the speeds add, so the other train runs at 90 − 42 = 48 km/h.
Answer: B) 48
Two trains, 137 m and 163 m long, run towards each other on parallel tracks. One of them runs at 42 km/h and they cross each other completely in 12 seconds. The speed of the other train (in km/h) is:
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