Posted by Dan on Tuesday, November 30, 2010 at 2:20pm.
The Cedar Bluff express KAT bus averages 15 mph for 20 minutes, and then 32 mph for 14 minutes. What was its average speed? (mph)

physics  Henry, Thursday, December 2, 2010 at 12:37am
d = V1*t1 + V2*t21,
d = 15 mi/h*(20/60)h + 32mi/h*(14/60)h,
d = 5 + 7.5 = 12.5 Miles.
t=20 min. + 14 min = 34 min = 0.567 h.
V(ave) = d / t = 12.5 / 0.567 = 22.1 mi/h. 
physics  Dan, Thursday, December 2, 2010 at 9:32am
thanks, I see where I messed up at...