Two trains 120 meters and 180 meters long are running in opposite directions at speeds of 42 km/h and 48 km/h respectively. In what time will they cross each other? MCQ with Answer and Explanation
Two trains 120 meters and 180 meters long are running in opposite directions at speeds of 42 km/h and 48 km/h respectively. In what time will they cross each other?
A. 10 seconds
B. 12 seconds
C. 16 seconds
D. 14 seconds
Answer: Option B
Solution (By JKSSB Mock Tests)
Total distance = 120 + 180 = 300 meters. Relative speed in opposite directions = 42 + 48 = 90 km/h = 25 m/s. Time taken = 300 / 25 = 12 seconds.
Two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. If the length of each train is 120 meters, in what time will they cross each other traveling in opposite directions?
Explanation:
Distance 1 = 50 * 3 = 150 km. Distance 2 = 60 * 2 = 120 km. Total distance = 270 km. Total time = 5 hours. Average speed = 270 / 5 = 54 km/h.
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