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Bob travelled 75% of the way from city A to city B by

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Senior Manager
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Bob travelled 75% of the way from city A to city B by [#permalink] New post 04 Jun 2005, 15:33
Bob travelled 75% of the way from city A to city B by driving for T hours at an average speed of V mph. He then drove at an average speed of S for the remainder of the trip. Which of the following expressions gives Bob's average speed for the entire journey from A to B?

(A) 4VT / [(T+S)/3]
(B) VT / 3S
(C) 0.75V + 0.25S
(D) 4VS / [3(S+V)]
(E) 4VS / (3S+V)
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Re: Another journey [#permalink] New post 04 Jun 2005, 17:33
cloudz9 wrote:
Bob travelled 75% of the way from city A to city B by driving for T hours at an average speed of V mph. He then drove at an average speed of S for the remainder of the trip. Which of the following expressions gives Bob's average speed for the entire journey from A to B?

(A) 4VT / [(T+S)/3]
(B) VT / 3S
(C) 0.75V + 0.25S
(D) 4VS / [3(S+V)]
(E) 4VS / (3S+V)


= VT 4/3 /(T + 1/3 VT/S) = 4 VS /(3S +V), E.
Senior Manager
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Posts: 273
Location: Auckland, New Zealand
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Re: Another journey [#permalink] New post 05 Jun 2005, 11:32
sparky wrote:
cloudz9 wrote:
Bob travelled 75% of the way from city A to city B by driving for T hours at an average speed of V mph. He then drove at an average speed of S for the remainder of the trip. Which of the following expressions gives Bob's average speed for the entire journey from A to B?

(A) 4VT / [(T+S)/3]
(B) VT / 3S
(C) 0.75V + 0.25S
(D) 4VS / [3(S+V)]
(E) 4VS / (3S+V)


= VT 4/3 /(T + 1/3 VT/S) = 4 VS /(3S +V), E.


Thats right! E is it! :)
Re: Another journey   [#permalink] 05 Jun 2005, 11:32
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Bob travelled 75% of the way from city A to city B by

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