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A car traveled 75% of the way from town A to town B by traveling at T

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A car traveled 75% of the way from town A to town B by traveling at T [#permalink]

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New post 27 Feb 2011, 11:53
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A car traveled 75% of the way from town A to town B by traveling at 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 average speed for the entire trip?

A. 0.75V + 0.25S
B. 0.75T + 0.25S
C. VT/(3S)
D. 4VT/(T+S)/3
E. 4VS/(3S+V)
[Reveal] Spoiler: OA
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Re: A car traveled 75% of the way from town A to town B by traveling at T [#permalink]

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New post 27 Feb 2011, 12:18
Let distance AB = 100 miles

75 miles @ V mph, time = 75/V
25 miles @ S mph, time = 25/S

Average speed = 100 / [75/V + 25/S] = 4VS/ 3S+V

Madelaine88 wrote:
A car traveled 75% of the way from town A to town B by traveling at 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 average speed for the entire trip?

A/ .75V+.25S
B/ .75T+.25S
C/ VT/3S
D/ 4VT/((T+S)/3)
E/ 4VS/ 3S+V
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Re: A car traveled 75% of the way from town A to town B by traveling at T [#permalink]

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New post 27 Feb 2011, 12:34
Let the distance between A and B be x.

T = 3/4* x/V
x = 4VT/3

Remaining distance = 0.25* VT/0.75 = VT/3

v_{avg} = Total Distance/(Time taken to travel 75%+Time taken to travel 25%)

\(v_{avg} = \frac{4VT}{3(T+\frac{VT}{3S})}\)

\(v_{avg} = \frac{4V}{3(1+\frac{V}{3S})}\)

\(v_{avg} = \frac{4VS}{(3S+V)}\)

Ans: "E"
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Re: A car traveled 75% of the way from town A to town B by traveling at T [#permalink]

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Re: A car traveled 75% of the way from town A to town B by traveling at T [#permalink]

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New post 02 Dec 2016, 03:36
Madelaine88 wrote:
A car traveled 75% of the way from town A to town B by traveling at 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 average speed for the entire trip?

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


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Re: A car traveled 75% of the way from town A to town B by traveling at T   [#permalink] 02 Dec 2016, 03:36
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