- A25 s
- B12.5 s
- C30 s
- D12 s
Step-by-Step Solution
Speeds: 15 m/s and 10 m/s. Opposite: relative 25 m/s, distance 300 m → 12 s. (12.5 s averages the two times.)
Answer: D) 12 s
Two trains of equal length take 10 seconds and 15 seconds to pass a telegraph post. If each is 150 m long, how long will they take to cross each other travelling in opposite directions?
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