Two goods trains of lengths 180 m and 220 m are running on parallel tracks in opposite directions with speeds of 42 km/h and 48 km/h respectively. In how many seconds will they pass each other completely?
Answer and explanation
Correct answer: C. 16 seconds
- Step 1: Total distance = 180 + 220 = 400 metres.
- Step 2: Relative speed = 42 + 48 = 90 km/h = 90 * (5/18) = 25 m/s.
- Step 3: Time taken = 400 / 25 = 16 seconds.
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