A slow moving truck covers a distance of 210 km at a uniform speed of 35 km/h. How much time does it take? MCQ with Answer and Explanation

Explanation:
Let total distance be 100 km. First part: 40 km at 40 km/h => time = 1 hour. Remaining distance = 60 km. Second part: 50% of 60 = 30 km at 30 km/h => time = 1 hour. Remaining distance = 30 km. Third part: 30 km at 15 km/h => time = 2 hours. Total time = 1 + 1 + 2 = 4 hours. Average speed = 100 / 4 = 25 km/h.

Explanation:
Speed of Y = 300 / 36 = 25/3 m/s. Distance covered by Y when X crosses the finish line at 33 seconds = (25/3) * 33 = 25 * 11 = 275 meters. Winning margin = 300 - 275 = 25 meters.

Explanation:
Let distance be d. d/72 - d/90 = 1 => (5d - 4d)/360 = 1 => d/360 = 1 => d = 360 km.