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19 Feb 2016, 23:30
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C
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:
79% (02:10) correct
21%
(02:23)
wrong
based on 225
sessions
History
Date
Time
Result
Not Attempted Yet
P beats Q by 125 meter in a kilometer race. Find Q's speed if P's speed is 16 meter/sec.
A) 21 meter/sec
B) 7 meter/sec
C) 14 meter/sec
D) 18 meter/sec
E) 28 meter/sec
A) 21 meter/sec
B) 7 meter/sec
C) 14 meter/sec
D) 18 meter/sec
E) 28 meter/sec
20 Feb 2016, 21:53
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Mesto
Hi,
Concept that would be important here is the distance covered is proportional to the speed and would have the same ratio..
distance P:Q= 1000:(1000-125)=1000:875= 8:7..
so the speed should also be in the same ratio..
so P:Q=16:Q=8:7...
hence Q=14
C
General Discussion
FightToSurvive
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19 Feb 2016, 23:47
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P's speed = 16m/s
P's distance = 1000m (as it is a km race)
t = 1000/16 = 62.5 sec
Q's distance = 1000-125= 875m
Q's time to complete this distance is also 62.5 sec.
Q's speed = dist/time = 875/62.5 = 14 m/s
Hence C is the answer.
P's distance = 1000m (as it is a km race)
t = 1000/16 = 62.5 sec
Q's distance = 1000-125= 875m
Q's time to complete this distance is also 62.5 sec.
Q's speed = dist/time = 875/62.5 = 14 m/s
Hence C is the answer.
