A boat can row 10 km/h in still water. If the river velocity is 2 km/h, find the distance covered downstream by the boat in 30 minutes. MCQ with Answer and Explanation

Explanation:
The train takes 12 seconds to cross its own length and 24 seconds to cross its own length plus the bridge. Therefore, it takes 24 - 12 = 12 seconds to cross the 240-meter bridge. Speed = 240 / 12 = 20 m/s. Length of train = Speed * Time to cross pole = 20 * 12 = 240 meters.

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.

Explanation:
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.