A man travels 1200 km by train at 80 km/h, 1600 km by ship at 40 km/h, 1000 km by plane at 400 km/h, and 200 km by car at 50 km/h. What is the average speed for the entire distance? (rounded off to 2 decimal places)
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 65.04 km/h.
Average speed = total distance/total time
Total distance = 1200 + 1600 + 1000 + 200 = 4000 km
Average speed = = 4000/(15 + 40 + 2.5 + 4) = 4000/61.5 = 65.04 km/h