A man walks 3 km at 4 km/h, 3 km at 6 km/h. Find average speed.
Show answer & explanation
Correct answer: A
Explanation
Given:
First distance = 3 km
First speed = 4 km/h
Second distance = 3 km
Second speed = 6 km/h
Formula:
Average speed = Total distance ÷ Total time
Time for the first part = 3 ÷ 4 = 0.75 hours
Time for the second part = 3 ÷ 6 = 0.5 hours
Total distance = 3 + 3 = 6 km
Total time = 0.75 + 0.5 = 1.25 hours
Average speed = 6 ÷ 1.25 = 4.8 km/h
Average speed = 4.8 km/h