- A90 s
- B80 s
- C58 s
- D60 s
Step-by-Step Solution
A must gain m on B. Relative speed km/h m/s → 90 s. (80 s forgets the final 50 m lead.)
Answer: A) 90 s
Train A (160 m, 72 km/h) runs behind train B (140 m, 54 km/h) on a parallel line in the same direction; A's front is 100 m behind B's rear. After how many seconds will A's rear be 50 m ahead of B's front?
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