A train passes a static observer in 10 seconds and a platform 150 meters long in 16 seconds. Find the length of the train. MCQ with Answer and Explanation

Explanation:
Let original speed be s. 240 / s - 240 / (s + 10) = 1 => 240(10) = s(s + 10) => 2400 = s(s + 10). Solving s^2 + 10s - 2400 = 0 gives (s - 40)(s + 50) = 0. Since speed is positive, s = 40 km/h.

Explanation:
Distance = 5.1 km = 5100 meters. Time taken = 5100 / 340 = 15 seconds.

Explanation:
Speed = 14.4 km/h = 14.4 * (5/18) = 4 m/s. Time = 10 minutes = 600 seconds. Total distance = 4 * 600 = 2400 meters. Number of rounds = 2400 / 400 = 6 rounds.