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...

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