A car covers four successive 3 km stretches at speeds of 10 km/h, 20 km/h, 30 km/h and 60 km/h respectively. Its average speed for this distance is: MCQ with Answer and Explanation

Explanation:
By 5:00 AM, the thief has traveled for 1 hour and covered 45 km. Relative speed = 60 - 45 = 15 km/h. Time taken to catch = 45 / 15 = 3 hours. Capture time = 5:00 AM + 3 hours = 8:00 AM.

Explanation:
Upstream speed = 12 - 4 = 8 km/h. Time taken = Distance / Upstream Speed = 48 / 8 = 6 hours.

Explanation:
Speed of B = 200 / 25 = 8 m/s. Distance covered by B when A crosses the finish line at 22 seconds = 8 * 22 = 176 meters. Winning margin = 200 - 176 = 24 meters.