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08 Dec 2015, 02:55
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
81% (02:02) correct
19%
(02:39)
wrong
based on 177
sessions
History
Date
Time
Result
Not Attempted Yet
It takes Joey the postman 1 hours to run a 3 mile long route every day. He delivers packages and then returns to the post office along the same path. If the average speed of the round trip is 5 mile/hour, what is the speed with which Joey returns?
A. 11
B. 12
C. 13
D. 14
E. 15
A. 11
B. 12
C. 13
D. 14
E. 15
08 Dec 2015, 03:59
Kudos
Bookmarks
let his speed for one half of the journey be 3 miles an hour
let the other half be x miles an hour
now,
avg speed =5 mile an hour
2*3*x/3+x=5
6x=5x+15=>x=15
let the other half be x miles an hour
now,
avg speed =5 mile an hour
2*3*x/3+x=5
6x=5x+15=>x=15
08 Dec 2015, 07:13
Kudos
Bookmarks
Total distance traveled by Joey = 2*3 miles = 6 miles
Time taken to cover the first leg of 3 miles = 1 hour
Average speed of the round trip = 5 miles/hour
Total time taken = Total Distance covered in round trip/Average Speed = 6/5 hour
Time taken in return trip = 6/5 - 1 = 1/5
Speed of Joey in return trip = 3/(1/5) = 15 miles/hour
Answer E
Time taken to cover the first leg of 3 miles = 1 hour
Average speed of the round trip = 5 miles/hour
Total time taken = Total Distance covered in round trip/Average Speed = 6/5 hour
Time taken in return trip = 6/5 - 1 = 1/5
Speed of Joey in return trip = 3/(1/5) = 15 miles/hour
Answer E
