Question
A train of length 180 m is running at a speed of 54
km/h. It passes another train of length 120 m running in the opposite direction, and they completely cross each other in 12 seconds. What is the speed of the second train?Solution
Total distance to be covered = sum of lengths = 180 + 120 = 300 m Time = 12 s Relative speed (in m/s) = distance / time = 300 / 12 = 25 m/s Convert to km/h: 25 × (18/5) = 90 km/h Let speed of second train = v km/h. Since they move in opposite directions: 54 + v = 90 v = 90 − 54 = 36 km/h
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