A train traveling at 72 km/h crosses a static tunnel in 15 seconds. If the length of the train is 100 meters, find the length of the tunnel. MCQ with Answer and Explanation

Explanation:
Total distance = 140 + 160 = 300 meters. Speed = 300 / 15 = 20 m/s. In km/h = 20 * (18/5) = 72 km/h.

Explanation:
Time taken to cross the platform distance alone = 20 - 8 = 12 seconds. Speed of the train = 240 / 12 = 20 m/s. Length of the train = Speed * Time to pass the person = 20 * 8 = 160 meters.

Explanation:
Downstream speed = 20 / 2 = 10 km/h. Upstream speed = 20 / 4 = 5 km/h. Speed in still water = (10 + 5) / 2 = 7.5 km/h.