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10 Aug 2017, 04:11
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
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Question Stats:
86% (01:13) correct
14%
(01:37)
wrong
based on 605
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Mr. Jones drove from Town A to Town B in x hours. On the return trip over the same route, his average speed was twice as fast. Which of the following expresses the total number of driving hours for the round trip?
(A) (2/3)x
(B) (3/2)x
(C) (5/3)x
(D) 2x
(E) 3x
(A) (2/3)x
(B) (3/2)x
(C) (5/3)x
(D) 2x
(E) 3x
10 Aug 2017, 06:06
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Answer - b
from a to b
t = x hrs (assume)
speed = y (assume)
speed is inversley prop. to time
So, y =k/x ( k is constant)
k= xy
From b to a
s= 2y
speed is inversely prop to time
so, 2y=k/t ( k is constant)
hence t =x/2
total time = x+x/2=3x/2
from a to b
t = x hrs (assume)
speed = y (assume)
speed is inversley prop. to time
So, y =k/x ( k is constant)
k= xy
From b to a
s= 2y
speed is inversely prop to time
so, 2y=k/t ( k is constant)
hence t =x/2
total time = x+x/2=3x/2
10 Aug 2017, 06:57
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During up trip he consumed X hour
During return since his speed was twice this mean he consumed half time as compared to up trip so it will be X/2
now sum the total trip
Total=X+X/2
3X/2
Option:B
During return since his speed was twice this mean he consumed half time as compared to up trip so it will be X/2
now sum the total trip
Total=X+X/2
3X/2
Option:B
