- A40 s
- B60 s
- C36 s
- D24 s
Step-by-Step Solution
Relative speed km/h m/s. It must gain the gap plus both lengths: m → 60 s. (36 s forgets the gap.)
Answer: B) 60 s
On parallel tracks, a 100 m train at 72 km/h is behind an 80 m train at 54 km/h going the same way. The front of the faster train is 120 m behind the rear of the slower one. How long until the faster train has completely passed the slower?
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