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During the three hours shown on the table the speed of the train

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During the three hours shown on the table the speed of the train [#permalink]

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New post 27 Oct 2017, 00:24
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

97% (00:35) correct 3% (00:10) wrong based on 63 sessions

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During the three hours shown on the table the speed of the train

(A) increased by 25%
(B) increased by 50%
(C) increased by 75%
(D) increased by 100%
(E) increased by 125%
[Reveal] Spoiler: OA

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Re: During the three hours shown on the table the speed of the train [#permalink]

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New post 27 Oct 2017, 04:23
(70-40)/40=3/4=75% increase...C

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Re: During the three hours shown on the table the speed of the train [#permalink]

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New post 27 Oct 2017, 04:34
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This is % change question.

Original speed (at the beginning) = 40

New speed (at the end) = 70

Difference = 70 - 40 = 30

% Change = Difference/Original = (30/40)*100 = 75 %

Since difference is +ve (or new speed > original speed), its increase.

Ans: (C) increased by 75%

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Re: During the three hours shown on the table the speed of the train [#permalink]

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New post 27 Oct 2017, 06:37
Is this a 600-700 level question ??

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Re: During the three hours shown on the table the speed of the train [#permalink]

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New post 30 Oct 2017, 14:03
Bunuel wrote:
Image
During the three hours shown on the table the speed of the train

(A) increased by 25%
(B) increased by 50%
(C) increased by 75%
(D) increased by 100%
(E) increased by 125%


Let’s determine the percentage increase of the speed of the train:

(70 - 40)/40 = 30/40 = 3/4 x 100 = 75%

Answer: C
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Kudos [?]: 902 [0], given: 5

Re: During the three hours shown on the table the speed of the train   [#permalink] 30 Oct 2017, 14:03
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