Question 1061326
5k @ 40 kph=1/8th hours=5/40ths hours
5k @ 100 kph=1/20th hours=2/40ths hours
Your total travel time is 7/40ths of an hour to go 10 km. So the average for the whole trip is 10/(7/40) kph, or 57.1429 kph. &#9786;&#9786;&#9786;&#9786;