Two passenger trains of equal layout lengths cross a station pole in 15 seconds and 30 seconds respectively. If each train length measures 150 meters, find the time parameter required to pass each other completely when tracking in opposite directions. MCQ with Answer and Explanation
Two passenger trains of equal layout lengths cross a station pole in 15 seconds and 30 seconds respectively. If each train length measures 150 meters, find the time parameter required to pass each other completely when tracking in opposite directions.
A. 18 seconds
B. 22 seconds
C. 20 seconds
D. 24 seconds
Answer: Option C
Solution (By JKSSB Mock Tests)
Speed of first train = 150 / 15 = 10 m/s. Speed of second train = 150 / 30 = 5 m/s. Total passing distance = 150 + 150 = 300 meters. Relative speed in opposite directions = 10 + 5 = 15 m/s. Time required = 300 / 15 = 20 seconds.
Explanation:
Let stream speed be c. Upstream speed = 15 - c, Downstream speed = 15 + c. Given: 2 * (15 - c) = 15 + c => 30 - 2c = 15 + c => 3c = 15 => c = 5 km/h.
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.
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