- A10
- B60
- C12
- D15
Step-by-Step Solution
Relative speed = 45 + 63 = 108 km/h = 30 m/s. Combined length = 120 + 180 = 300 m. Time = 300 ÷ 30 = 10 seconds.
Answer: A) 10
On parallel tracks, a 120 m train at 45 km/h and a 180 m train at 63 km/h approach each other from opposite directions. How many seconds pass from the moment they meet until they have completely passed each other?
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