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John traveled the entire 60 miles trip. If he did the first

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John traveled the entire 60 miles trip. If he did the first

by Max@Math Revolution » Sat Feb 13, 2016 9:49 pm
John traveled the entire 60 miles trip. If he did the first 12 miles of at a constant rate 24 miles per hour and the remaining trip of at a constant rate 48 miles per hour, what is the his average speed, in miles per hour?

A. 20mph
B. 24mph
C. 30mph
D. 32mph
E. 40mph


* A solution will be posted in two days.
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by lucas211 » Tue Feb 16, 2016 4:51 pm
Hi Max

So John traveled 12 miles at a constant rate of 24 - or for 1/2 hour. Hereafter he traveled the last (60-12 miles) 48 miles at a constant rate of 48 miles pr. hour - or for 1 hour.

we use the formula: distance = time*speed => speed = distance/time, in which we can insert the above; speed = 60 miles / 11/2 hour
and get the answer E
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