Bunuel wrote:

Was Rylon’s average speed greater than 55 miles per hour?

(1) Rylon drove 100 miles in 1 hour 48 minutes.

(2) Rylon drove 60 miles at an average speed of 60 miles per hour, and then drove 40 miles at an average speed of 50 miles per hour.

Average Speed = Total distance/Total time

St 1: A.S. = 100 /1.8A.S. = 55.555 m/h

SufficientSt 2: Time 1 = 60/60 = 1hr

Time 2 = 40/50 = 0.8 hr

A.S. = (60 + 40)/1.8

A.S = 55.555 m/h

Sufficient(D)

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"Do not watch clock; Do what it does. KEEP GOING."