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A man cycling along the road noticed that every 12 minutes

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Manager
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Joined: 03 May 2017
Posts: 112

Kudos [?]: 19 [0], given: 14

Re: A man cycling along the road noticed that every 12 minutes [#permalink]

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New post 03 Jul 2017, 05:50
If we assume the cyclist is standing still 1 mile between both buses. Then, either add the speeds and multiply by the total distance.

i.e 1/4+1/12 = 1/3; combined time is 3 and now multiply by 2 to get the time interval of 6.

or

Again assuming the cyclist is still and between both buses, just subtract the speeds of the buses to get the absolute difference (interval) between their arrivals.

Conceptually, this question is similar to number line questions and could also be a great data sufficiency question.

i.e 1/4- 1/12 =1/6 and time interval =6.

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Re: A man cycling along the road noticed that every 12 minutes [#permalink]

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New post 09 Oct 2017, 17:01
I'm a bit confused by the last part "d=12b−6b=6b." How did you get 12b and 6b?

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A man cycling along the road noticed that every 12 minutes [#permalink]

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New post 09 Oct 2017, 20:24
jlstiles455 wrote:
I'm a bit confused by the last part "d=12b−6b=6b." How did you get 12b and 6b?


Hi,

If you are referring to Bunuel's explanation above. Note that from 4(b+c) =12(b-c) = d, we get 8b= 16c= d, and b=2c or c=b/2= 0.5b
Then If you substitute c for b, you had get d= 12(b-0.5b) = 4(b+0.5b) = 6b.

Best,

Kudos [?]: 19 [0], given: 14

A man cycling along the road noticed that every 12 minutes   [#permalink] 09 Oct 2017, 20:24

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