Answer: C
S1: not sufficient, the first 17 miles speed or time taken by David is not known.
S2: not sufficient, the last 13 miles speed or time taken by David is not known.
S1+S2: We know the time it took for David to complete the entire 30 miles: 40 mins + 45 mins = 85 mins. ANS C
Bunuel wrote:
In a boat race between David and Jeff, when Jeff had covered half the 30-mile race distance, David was 2 miles ahead of Jeff. How long did it take David to travel the entire 30-mile distance?
(1) David traveled the last 15 miles of the race’s distance in 40 minutes.
(2) Jeff traveled the first 15 miles of the race’s distance in 45 minutes.
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