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Cyclist P increases his speed from 10 miles per hour to 25 miles per

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Intern
Joined: 21 Aug 2018
Posts: 4
Cyclist P increases his speed from 10 miles per hour to 25 miles per  [#permalink]

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Updated on: 19 Sep 2018, 20:18
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Difficulty:

45% (medium)

Question Stats:

59% (01:22) correct 41% (01:10) wrong based on 48 sessions

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Cyclist P increases his speed from 10 miles per hour to 25 miles per hour in the last lap, while another Cyclist Q increases his speed from 8 miles per hour to 24 miles per hour in the last lap. By what percent is the percent increase in speed of Cyclist Q more than that of Cyclist P?

(A) 33.33
(B) 50
(C) 66.67
(D) 75
(E) 100

Originally posted by patnaiksonal on 19 Sep 2018, 08:27.
Last edited by Bunuel on 19 Sep 2018, 20:18, edited 1 time in total.
Renamed the topic and edited the question.
Intern
Joined: 15 Sep 2018
Posts: 35
GMAT 1: 660 Q50 V29
Re: Cyclist P increases his speed from 10 miles per hour to 25 miles per  [#permalink]

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19 Sep 2018, 08:36
The % increase in 1st case is

(25-10)/10*100=150%

The % increase in 2nd case is

(24-8)/8*100=200%

Hence the % increase for the two cases is
(200-150)/150*100=33.33%
Intern
Joined: 21 Aug 2018
Posts: 4
Re: Cyclist P increases his speed from 10 miles per hour to 25 miles per  [#permalink]

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19 Sep 2018, 08:50
subhsngh0

why is it not 50%? (200% - 150%)
Senior Manager
Joined: 18 Jun 2018
Posts: 268
Re: Cyclist P increases his speed from 10 miles per hour to 25 miles per  [#permalink]

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19 Sep 2018, 09:00
patnaiksonal wrote:
Cyclist P increases his speed from 10 miles per hour to 25 miles per hour in the last lap, while
another Cyclist Q increases his speed from 8 miles per hour to 24 miles per hour in the last lap.
By what percent is the percent increase in speed of Cyclist Q more than that of Cyclist P?

(A) 33.33
(B) 50
(C) 66.67
(D) 75
(E) 100

OA: A

Cyclist P's Initial speed: 10 miles per hour
Cyclist P's Final speed: 25 miles per hour
Percentage increase in Cyclist P's speed : $$\frac{25-10}{10}*100=150$$%

Cyclist Q's Initial speed: 8 miles per hour
Cyclist P's Final speed: 24 miles per hour
Percentage increase in Cyclist P's speed : $$\frac{24-8}{8}*100=200$$%

Percentage difference between Cyclist Q and Cyclist P speed $$= (200-150)$$% $$= 50$$%

Required percentage $$= \frac{50%}{150%}*100 =33.3$$%
Intern
Joined: 15 Sep 2018
Posts: 35
GMAT 1: 660 Q50 V29
Re: Cyclist P increases his speed from 10 miles per hour to 25 miles per  [#permalink]

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19 Sep 2018, 17:43
patnaiksonal wrote:

why is it not 50%? (200% - 150%)

Whenever you are calculating % increase you have divide the change(50 in this case) by original (150 in this case) then only you get the per cent change
Director
Joined: 12 Feb 2015
Posts: 875
Re: Cyclist P increases his speed from 10 miles per hour to 25 miles per  [#permalink]

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25 Sep 2018, 10:19
Cyclist P increases speed by 150% and Cyclist Q increases speed by 200%

Q increases his speed by 50% more than the increase in P's speed or 50%/150%=33.33% (Option A is the correct ans)
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Re: Cyclist P increases his speed from 10 miles per hour to 25 miles per   [#permalink] 25 Sep 2018, 10:19
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