You drive on an interstae 10 from San Antonio to Huston, half the [b]time[/b] at 55km/h and the other half at 90km/h. On the way back you travel half the [b]distance[/b] at 55km/h and the other half at 90km/h.
What is your average speed from San Antonio to Houston
What is your speed from houston to San Antonio?
c) speed for entire trip
d) What is your average velocity for the whole trip?
see the last post before this.
let d be half the distance from sananton to houston.
time= d/55 + d/90
avg speed = 2d/time
I will behappy to critique your work.
how far can sound go on for
http://news.bbc.co.uk/1/hi/magazine/4521232.stm
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