Two standard passenger trains 160 meters and 140 meters long run on parallel tracks in opposite directions at 42 km/h and 30 km/h. Find the time needed to cross each other completely. MCQ with Answer and Explanation
Two standard passenger trains 160 meters and 140 meters long run on parallel tracks in opposite directions at 42 km/h and 30 km/h. Find the time needed to cross each other completely.
A. 19 seconds
B. 13 seconds
C. 15 seconds
D. 17 seconds
Answer: Option C
Solution (By JKSSB Mock Tests)
Total distance = 160 + 140 = 300 meters. Relative speed = 42 + 30 = 72 km/h = 20 m/s. Time taken = 300 / 20 = 15 seconds.
Two trains 120 meters and 80 meters long are running along parallel tracks in the same direction at speeds of 46 km/h and 36 km/h respectively. In what time will the faster train cross the slower train completely?
A train 120 meters long passes an active crossing signal point in 6 seconds flat. Find the time interval needed to clear a station platform 240 meters long.
Explanation:
Let total distance be 120 km. First part = 40 km; Time = 40 / 40 = 1 hour. Remaining part = 80 km; Time = 80 / 80 = 1 hour. Total distance = 120 km, Total time = 2 hours. Average speed = 120 / 2 = 60 km/h.
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