A passenger train clears a station side signal pillar in exactly 12 seconds. If the length of the train is 180 meters, find its speed in km/h. MCQ with Answer and Explanation

Explanation:
Distance is constant, so S1 * T1 = S2 * T2 => 45 * 40 = S2 * 30 => S2 = (45 * 40) / 30 = 60 km/h.

Explanation:
Let total distance be 120 km. First part = 40 km; Time = 40 / 40 = 1 hour. Remaining part = 80 km; Time = 80 / 80 = 1 hour. Total distance = 120 km, Total time = 2 hours. Average speed = 120 / 2 = 60 km/h.

Explanation:
Perimeter of the hexagonal field = 6 * 50 = 300 meters. Speed = 15 km/h = 15 * (5/18) = 25/6 m/s. Time = Distance / Speed = 300 / (25/6) = 300 * 6 / 25 = 12 * 6 = 72 seconds.