Two trains of equal length cross a pole in 12 seconds and 18 seconds respectively. If the length of each train is 180 meters, find the time taken by them to pass each other when running in opposite directions. MCQ with Answer and Explanation
Two trains of equal length cross a pole in 12 seconds and 18 seconds respectively. If the length of each train is 180 meters, find the time taken by them to pass each other when running in opposite directions.
A. 13.2 seconds
B. 14.4 seconds
C. 16.0 seconds
D. 15.6 seconds
Answer: Option B
Solution (By JKSSB Mock Tests)
Speed of first train = 180 / 12 = 15 m/s. Speed of second train = 180 / 18 = 10 m/s. Total distance to cross = 180 + 180 = 360 meters. Relative speed in opposite directions = 15 + 10 = 25 m/s. Time taken = 360 / 25 = 14.4 seconds.
A train 250 meters long passes a static track utility pole in 10 seconds flat. Find the time it takes to completely pass a platform of length 500 meters.
Explanation:
Total distance = 50 + 90 = 140 km. Time for first part = 50 / 25 = 2 hours. Time for second part = 90 / 30 = 3 hours. Total time = 5 hours. Average speed = 140 / 5 = 28 km/h.
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