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25 Jun 2016, 22:17
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
85% (01:41) correct
15%
(02:01)
wrong
based on 932
sessions
History
Date
Time
Result
Not Attempted Yet
Adam and Beth each drove from Smallville to Crown City by different routes. Adam drove an an average speed of 40 miles per hour and completed the trip in 30 minutes. Beth's route was 5 miles longer, and it took her 20 minutes more than Adam to complete the trip. How many miles per hour was Beth's average speed on this trip?
(A) 24
(B) 30
(C) 48
(D) 54
(E) 75
(A) 24
(B) 30
(C) 48
(D) 54
(E) 75
25 Jun 2016, 23:21
Kudos
Bookmarks
Speed = Distance/Time
Distance for Adam = Speed * Time = 40 * 1/2 = 20 miles
Distance for Beth = Distance for Adam+5 = 20+5 = 25 miles
Time taken by Beth = Time taken by Adam + (1/3 hour) = 1/2+1/3 = 5/6
Speed of Beth = D/T = 25/(5/6) = 25*6/5 = 30 miles per hour
Hence, B is the answer.
---------------------------------
P.S. Don't forget to give Kudos
Distance for Adam = Speed * Time = 40 * 1/2 = 20 miles
Distance for Beth = Distance for Adam+5 = 20+5 = 25 miles
Time taken by Beth = Time taken by Adam + (1/3 hour) = 1/2+1/3 = 5/6
Speed of Beth = D/T = 25/(5/6) = 25*6/5 = 30 miles per hour
Hence, B is the answer.
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P.S. Don't forget to give Kudos
General Discussion
