Asked by Henwy

I got in my car and drove 40 miles to see my cousin at a rate of 20 mph. Then, I left my cousin’s house and drove another 30 miles to the store but this time went 10 mph. What was my average speed for the whole trip?

Answers

Answered by oobleck
speed = distance/time, so
(40+30)/(40/20 + 30/10) = (40+30)/(2+3) = 70/5 = 14 mi/hr
Answered by henry2,
d1 = r1*T1
40 = 20T1
T1 = 2h.

d2 = r2*T2
30 = 10T2
T2 = 3h.

d = r*T
40+30 = r*(2+3).
r = 14 mi/h.



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