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Average speed = the total distance / the total time. The first 20 miles took 1/3 hr and the rest 20 miles took 2/3 hr. Then, the average speed=(20 miles + 20 miles)/(1/3 + 2/3) hr= 40 miles/1hr. Hence, the correct answer is C.
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I did like this: 20/60 + 20/30 = 6/6 = 1
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Found this to be the most simpler method
20miles/60+20miles/30=40miles/x
or, 20/60+40/60= 40/x
or, 1=40/x
or, x=40
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avg speed since distance is same;
2*60*30/90 ; 40 mph
IMO C


MathRevolution
Jane goes the trip of 40miles, the first 20 miles at 60 miles per hour and the rest 20 miles at 30 miles per hour, what is the average speed of the entire trip?
A. 30miles/1hr
B. 36miels/1hr
C. 40miles/1hr
D. 42miels/1hr
E. 45miles/1hr


* A solution will be posted in two days.
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For solving such questions, we have the formula of harmony average( mean):
n / 1/x + 1/x'
That is, 2/ 1/60 + 1/30=
120/3=40
Option C

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