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. MCQ with Answer and Explanation
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.
A. 26 seconds
B. 35 seconds
C. 30 seconds
D. 32 seconds
Answer: Option C
Solution (By JKSSB Mock Tests)
Speed of train = 250 / 10 = 25 m/s. Total distance to pass platform = 250 + 500 = 750 meters. Time taken = 750 / 25 = 30 seconds.
A train 120 meters long running at 108 km/h completely passes another train 180 meters long running at 72 km/h in the same direction. How much time do they take to clear each other?
Explanation:
Total distance to be covered = 120 + 180 = 300 meters. Relative speed in same direction = 108 - 72 = 36 km/h = 36 * (5/18) = 10 m/s. Time taken = 300 / 10 = 30 seconds.
Explanation:
Ratio of speeds = 3:4, so ratio of times taken = 4:3. Given 4 parts = 36 seconds => 1 part = 9 seconds. Time taken by the second runner = 3 parts = 3 * 9 = 27 seconds.
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