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On a recent trip, Pat drove 10 miles. What Pat's average speed?
(1) Pat drove 6 miles at an average speed of 12 miles per hour and then drove the remaining 4 miles at an average speed of 10 miles per hour.
(2) Pat drove a total of 0.9 hours.
(1) Pat drove 6 miles at an average speed of 12 miles per hour and then drove the remaining 4 miles at an average speed of 10 miles per hour.
(2) Pat drove a total of 0.9 hours.
15 Aug 2019, 09:57
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Bunuel
On a recent trip, Pat drove 10 miles. What Pat's average speed?
(1) Pat drove 6 miles at an average speed of 12 miles per hour and then drove the remaining 4 miles at an average speed of 10 miles per hour.
(2) Pat drove a total of 0.9 hours.
(1) Pat drove 6 miles at an average speed of 12 miles per hour and then drove the remaining 4 miles at an average speed of 10 miles per hour.
(2) Pat drove a total of 0.9 hours.
total speed ; total distance / total time
#1
total tim e; 6/12 + 4/10 = 0.9 hrs
total avg speed ; 10/0.9 sufficient
#2
sufficient
IMO D
15 Aug 2019, 10:26
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Bunuel
On a recent trip, Pat drove 10 miles. What Pat's average speed?
(1) Pat drove 6 miles at an average speed of 12 miles per hour and then drove the remaining 4 miles at an average speed of 10 miles per hour.
(2) Pat drove a total of 0.9 hours.
(1) Pat drove 6 miles at an average speed of 12 miles per hour and then drove the remaining 4 miles at an average speed of 10 miles per hour.
(2) Pat drove a total of 0.9 hours.
Given: On a recent trip, Pat drove 10 miles.
Asked: What Pat's average speed?
(1) Pat drove 6 miles at an average speed of 12 miles per hour and then drove the remaining 4 miles at an average speed of 10 miles per hour.
Total time = 6/12 + 4/10 = .9 hours
Average speed = 10/.9 = 11 1/9 miles / hour
SUFFICIENT
(2) Pat drove a total of 0.9 hours.
Average speed = 10/.9 = 11 1/9 miles / hour
SUFFICIENT
IMO D
