- A12
- B10
- C14
- D84
Step-by-Step Solution
Relative speed = 54 + 72 = 126 km/h = 35 m/s. Distance = 200 + 220 = 420 m. Time = 420 / 35 = 12 seconds. (Subtracting the speeds gives 84 s.)
Answer: A) 12
On parallel tracks, a 200 m passenger train at 54 km/h and a 220 m express at 72 km/h run towards each other. How many seconds pass from the moment their engines meet until their last coaches clear each other?
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