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01 Jul 2019, 01:50
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:
79% (01:11) correct
21%
(01:06)
wrong
based on 97
sessions
History
Date
Time
Result
Not Attempted Yet
Juan bikes halfway to school at 9 miles per hour, and walks the rest of the distance at 3 miles per hour. What is Juan's average speed for the whole trip?
A. 4 mph
B. 4.5 mph
C. 5 mph
D. 5.5 mph
E. 6 mph
A. 4 mph
B. 4.5 mph
C. 5 mph
D. 5.5 mph
E. 6 mph
Updated on: 01 Jul 2019, 01:56
Originally posted by CareerGeek on 01 Jul 2019, 01:56.
Last edited by CareerGeek on 01 Jul 2019, 01:56, edited 1 time in total.
Last edited by CareerGeek on 01 Jul 2019, 01:56, edited 1 time in total.
Kudos
Bookmarks
Bunuel
Let the distance between school and home = 2x
He travels x miles @9 mph speed and remaining x miles @ 3 mph speed
Total time = \(t_1\) + \(t_2\)
= x/9 + x/3
= (x + 3x)/9
= 4x/9
\(Average Speed = \frac{Total Distance}{Total Time}\)
= 2x/(4x/9)
= 2*9/4
= 4.5 mph
IMO Option B
Pls Hit kudos if you like the solution
01 Jul 2019, 01:56
Kudos
Bookmarks
Bunuel
Let us assume distance = 2d
Total time taken = \(\frac{d}{9} + \frac{d}{3} = \frac{4d}{9}\)
Average speed = \(2d/\frac{4d}{9} = \frac{9}{2} = 4.5 mph\)
IMO B
