Interesting Puzzle Guys:
Jack drive to his office at an average speed of 20km/hr. After reaching the Pony Ranch, he realize that today is a holiday of 'Dia Del Los Muertes'. He returned home at average speed of 30km/hr. Discounting the time spent at the ranch, what was his average speed of his journey ?

Question

Interesting Puzzle Guys: 
Jack drive to his office at an average speed of 20km/hr. After reaching the Pony Ranch, he realize that today is a holiday of 'Dia Del Los Muertes'. He returned home at average speed of 30km/hr. Discounting the time spent at the ranch, what was his average speed of his journey ?

cwrw238 · Answer

assume the office is 10 miles form his home
calculate the times for each part of his journey then add them
then average speed is  20 / time

jack1 · Answer

yeah, i know the answer, it's just an interest only thing, most ppl automatically say "25"without thinking first

cwrw238 · Answer

you can't just average the times  20 + 30 / 2  since speeds are a ratio.

cwrw238 · Answer

right - a lot of people do  just that

jack1 · Answer

everything just seemed... tooooo quiet... ;)

jack1 · Answer

anyone who reads this afterwards : TL;DR - average speed = 24 km/hr