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Zeke drove from his house to a furniture store in Atlanta and then back home along the same route. It took Zeke three hours to drive to the store. By driving an average of 20 mph faster on his return trip, Zeke was able to save an hour of driving time.

What was Zeke's average driving speed on his round trip?

a) 60 mph
b) 70 mph
c) 80 mph
d) 90 mph

Answer :

b) 70 mph, Zeke's average driving speed on his round trip is 70 mph, as calculated through the given information and the speed differential between the two trips.

The correct option is: b) 70 mph

To find Zeke's average driving speed on his round trip, we can set up equations based on the given information. Let x be Zeke's average speed going to the store. So, his speed on the return trip will be x + 20 mph. From the information given, we can form two equations:

  1. 3 = d / x
  2. 2 = d / (x + 20)

Solving these equations simultaneously, we find that x = 50 mph. Therefore, Zeke's average driving speed on his round trip is 70 mph.

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