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A is twice as fast as B and B is thrice as fast as C. If B takes 18 mi

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Senior Manager
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D
Joined: 29 Nov 2018
Posts: 280
Concentration: Marketing, Strategy
A is twice as fast as B and B is thrice as fast as C. If B takes 18 mi  [#permalink]

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New post 08 Mar 2019, 09:08
1
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

77% (02:07) correct 23% (01:16) wrong based on 30 sessions

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A is twice as fast as B and B is thrice as fast as C. If B takes 18 minutes to cover a certain distance, find the difference in the time taken by A and C to cover the same distance.

1. 30 mins
2. 36 mins
3. 40 mins
4. 45 mins
5. 54 mins
Senior Manager
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Joined: 25 Feb 2019
Posts: 336
Re: A is twice as fast as B and B is thrice as fast as C. If B takes 18 mi  [#permalink]

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New post 08 Mar 2019, 09:17
A is twice fast as B .

then time will be in inverse proportion.

So time taken by A = B/2 = 9 mins

B is thrice fast as C then time takne by C = 3*B = 3*18=54

difference = 45 mins

IMO D

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A is twice as fast as B and B is thrice as fast as C. If B takes 18 mi  [#permalink]

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New post 10 Mar 2019, 06:59
A=2B; B=3C;

B takes 18 mins to do the job. From the formula w=r*t, we get
1/B=18

Similarly, by substituting we get rates of A and C as,
1/A=9 and 1/C=54

Difference - 54-9=45 mins

D


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A is twice as fast as B and B is thrice as fast as C. If B takes 18 mi   [#permalink] 10 Mar 2019, 06:59
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A is twice as fast as B and B is thrice as fast as C. If B takes 18 mi

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