Question 288779
s=distance to San Antonio
50x=s/2
x=s/100
92y=s/2
y=s/184
d/t=r
(total distance)/(total time)=average rate
{{{s/(s/100+s/184)}}}=64.79 kph

not (92+50)/2
not 142/2=71
Why? Because he spent more time at 50 kph than at 92 kph