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? MCQ with Answer and Explanation
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. 90 seconds
B. 64 seconds
C. 80 seconds
D. 72 seconds
Answer: Option D
Solution (By JKSSB Mock Tests)
Total distance = 120 + 80 = 200 meters. Relative speed in same direction = 46 - 36 = 10 km/h = 10 * (5/18) = 25/9 m/s. Time required = 200 / (25/9) = 200 * 9 / 25 = 8 * 9 = 72 seconds.
A motorboat tracks 48 km downstream in 3 hours and handles the same route upstream back to the origin line in 6 hours. Find the baseline speed of the boat hull in still water.
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