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Andy drove from Townville to Villageton at an average speed of 40 mile

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Andy drove from Townville to Villageton at an average speed of 40 mile [#permalink] New post   01 Dec 2022, 06:31
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70% (01:16) correct 29% (01:07) wrong based on 31 sessions

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Andy drove from Townville to Villageton at an average speed of 40 miles per hour. He then drove from Villageton to Townville at an average speed of 60 miles per hour.


Quantity A
Quantity B
50
The average speed of Andy's entire trip in miles per hour.



A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.


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A
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Re: Andy drove from Townville to Villageton at an average speed of 40 mile [#permalink] New post   02 Dec 2022, 09:28
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Time= distance/speed

d/40+d/60=5d/120

average speed is 2d/5d/120 =48

A is the answer
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Re: Andy drove from Townville to Villageton at an average speed of 40 mile [#permalink] New post   02 Dec 2022, 09:31
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second approach is to use weighted avergae

sum up the two speeds 60+40=100/2=50

However the first stretch is faster than the second one and it pulls down the overall speed to less than 50

a is the answer
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Re: Andy drove from Townville to Villageton at an average speed of 40 mile [#permalink]
02 Dec 2022, 09:31
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