Question

An Olympic marathoner passes the 5km point of the race after 15 minutes and reaches the 22km point after 3.1hours. find the average speed of the runner in km/hr.

help please

Answer 1

avr=[(5*1/4)+(22*3.1)]/(3.1+1/4)=20.73km/hr

Answer 2

it says thats wrong...

Answer 3

8.06km/ hr

Answer 4

the average speed = total distance / time
if we are talking about the average for the whole 22 km it is

22 / 3.1 = 7.1 km/hr

for the second part, distance = 22 - 5 = 17 and time = 3.1 - .25 = 2.85
avg speed = 17/ 2.85 = 5.96