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10 Aug 2017, 04:11
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B
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Difficulty:
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Question Stats:
85% (01:13) correct
15%
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wrong
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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
