Question

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)

Answer 1

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.

Answer 2

thanks, I see where I messed up at...