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Susan travels by car at an average speed of 50 miles per hour for 4 ho

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Math Expert
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Susan travels by car at an average speed of 50 miles per hour for 4 ho  [#permalink]

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New post 03 Jan 2019, 11:57
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A
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Difficulty:

  5% (low)

Question Stats:

87% (00:52) correct 13% (00:40) wrong based on 54 sessions

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Re: Susan travels by car at an average speed of 50 miles per hour for 4 ho  [#permalink]

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New post 03 Jan 2019, 12:10
Imo D

50*4 +20*2=240 miles

240/6=40m/hr

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Re: Susan travels by car at an average speed of 50 miles per hour for 4 ho  [#permalink]

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New post 05 Jan 2019, 20:23
Bunuel 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



50*4 =200 miles --> Distance 1

20*2=40 miles --> Distance 2

total distance = Distance 1 + Distance 2 = 240 mles

average speed = Total distance / Total time

240/6=40m/hr
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Re: Susan travels by car at an average speed of 50 miles per hour for 4 ho  [#permalink]

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New post 06 Jan 2019, 05:15
Bunuel 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



avg speed = total distance/ total time

total distance= 50*4 + 20*2 = 240

time = 6 hrs
avg speed = 240 /6 = 40 IMO D
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Re: Susan travels by car at an average speed of 50 miles per hour for 4 ho   [#permalink] 06 Jan 2019, 05:15
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Susan travels by car at an average speed of 50 miles per hour for 4 ho

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