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a car traveled 75% of the way from town A to town B by

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SVP
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a car traveled 75% of the way from town A to town B by [#permalink] New post 26 Feb 2005, 09:22
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a car traveled 75% of the way from town A to town B by traveling for T hours at an average speed of V mph. the car travels at an average speed of S mph for the remaining part of the trip. which of the following expressions represents the time the car traveled at S mph ?

a VT/S
b V/4T
c 4VT/3S
d 3S/VT
e VT/3S
Director
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 [#permalink] New post 26 Feb 2005, 11:57
My answer is VT/3S
Explanation:
Denote A -> B = X
So VT=3/4X -> 4/3VT =X
we must find
t=(1/4X)/S
t=(1/4*4/3)VT/S
Finally 1/3*VT/S
Manager
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 [#permalink] New post 27 Feb 2005, 02:03
VT is 3/4th distance.So remaining 1/4th is VT/3.Now devide it by speed.So VT/3S.
  [#permalink] 27 Feb 2005, 02:03
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