a marathoner ran the 26.2-mi New York City marathon in 2.2h. show that at least twice, the marthoner was running at exactly 11 mph

4 answers

the average is 26.2/2.2=11.9mph

Didnt the runner have to stop and start?
show that the solution has exactly one solution in the interval

x+ln(x+1)=0, 0<and equal to x <and equal to 3
9=0
12