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

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

anonymous · Answer

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

anonymous · Answer

it says thats wrong...

anonymous · Answer

8.06km/ hr

anonymous · Answer

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