Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr, respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other is?
When trains move in opposite directions, their relative speed is summed. Convert speeds to m/s and total distance to meters. Time is total distance divided by relative speed, yielding 10.8 seconds.
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