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20 Mar 2016, 02:37
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
73% (02:26) correct
27%
(02:24)
wrong
based on 292
sessions
History
Date
Time
Result
Not Attempted Yet
Ron walks to a viewpoint and returns to the starting point by his car and thus takes a total time of 6 hours 45 minutes. He would have gained 2 hours by driving both ways. How long would it have taken for him to walk both ways.
A. 8 h 45 min
B. 7 h 45 min
C. 6 h 45 min
D. 5 h 30 min
E. None of these
A. 8 h 45 min
B. 7 h 45 min
C. 6 h 45 min
D. 5 h 30 min
E. None of these
20 Mar 2016, 02:44
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Bookmarks
Bunuel
Ron walks to a viewpoint and returns to the starting point by his car and thus takes a total time of 6 hours 45 minutes. He would have gained 2 hours by driving both ways. How long would it have taken for him to walk both ways.
A. 8 h 45 min
B. 7 h 45 min
C. 6 h 45 min
D. 5 h 30 min
E. None of these
A. 8 h 45 min
B. 7 h 45 min
C. 6 h 45 min
D. 5 h 30 min
E. None of these
SOLUTION:
1. (Walking to a viewpoint) + (Driving back) = (6 hours 45 minutes)
2. (Driving to a viewpoint) + (Driving back) = (6 hours 45 minutes - 2 hours) = (4 hours 45 minutes), therefore (one way driving) = (4 hours 45 minutes)/2 = (2 hours 22.5 minutes).
3. From 1. (Walking to to a viewpoint) = (6 hours 45 minutes) - (2 hours 22.5 minutes) = (4 hours 22.5 minutes).
4. (Walking to to a viewpoint) + (Walking back) = (4 hours 22.5 minutes) + (4 hours 22.5 minutes) = (8 hours 45 minutes).
Answer: A.
Hope it's clear.
20 Mar 2016, 15:37
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let t=hours to walk 1/2 distance
27/4-8/4=19/4 hours to drive total distance
(19/4)/2=19/8 hours to drive 1/2 distance
t+19/8-2=19/4
t=35/8=4 h 22.5 min
2t=8 h 45 min
27/4-8/4=19/4 hours to drive total distance
(19/4)/2=19/8 hours to drive 1/2 distance
t+19/8-2=19/4
t=35/8=4 h 22.5 min
2t=8 h 45 min
