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Susan travels by car at an average speed of 50 miles per

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GMAT Club Legend
GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4756
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1668 [0], given: 396

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Susan travels by car at an average speed of 50 miles per [#permalink] New post 24 Nov 2017, 20:39
Expert's post
00:00

Question Stats:

100% (00:11) correct 0% (00:00) wrong based on 9 sessions
Susan travels by car at an average speed of 50 miles per hour for 4 hours and then at an average speed of 20 miles per hour for 2 hours. What is her average speed, in miles per hour, for the entire 6-hour trip?

A. 25
B. 30
C. 35
D. 40
E. 45

Drill 1
Question: 4
Page: 521
[Reveal] Spoiler: OA

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Sandy
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Director
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Joined: 20 Apr 2016
Posts: 762
Followers: 6

Kudos [?]: 522 [0], given: 94

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Re: Susan travels by car at an average speed of 50 miles per [#permalink] New post 02 Dec 2017, 10:55
sandy wrote:
Susan travels by car at an average speed of 50 miles per hour for 4 hours and then at an average speed of 20 miles per hour for 2 hours. What is her average speed, in miles per hour, for the entire 6-hour trip?

A. 25
B. 30
C. 35
D. 40
E. 45

Drill 1
Question: 4
Page: 521


Here in the first part,

Distance = speed * Time

Distance = 50 * 4 = 200 miles (Speed = 50 miles per hour ; Time = 4 hrs)

in the second part

Distance = 20 * 2 = 40 miles (Speed = 20 miles per hour ; Time = 2 hrs)

Therefore Total distance = 240 miles.

Av speed for the entire trip = 240/6 = 40 miles per hour (Since total time = 6 hrs)
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GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4756
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 93

Kudos [?]: 1668 [0], given: 396

CAT Tests
Re: Susan travels by car at an average speed of 50 miles per [#permalink] New post 09 Dec 2017, 19:45
Expert's post
Explanation

Use the given averages to figure out Susan’s total distance: 4 hours at an average speed of 50 miles per hour is a total of 200 miles, and 2 hours at an average speed of 20 miles per hour is a total of 40 miles.


Susan goes a total of 240 miles in 6 hours, thus, her average speed is \(\frac{240}{6}\) miles/hour, or 40 miles per hour.

The answer is choice D.
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Sandy
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Re: Susan travels by car at an average speed of 50 miles per   [#permalink] 09 Dec 2017, 19:45
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Susan travels by car at an average speed of 50 miles per

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