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During a certain bicycle ride, was Sherry's average speed faster than

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Ryerson (Ted Rogers) Thread Master
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During a certain bicycle ride, was Sherry's average speed faster than [#permalink]

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New post 23 Dec 2015, 20:03
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During a certain bicycle ride, was Sherry's average speed faster than 24 kilometers per hour? (1 kilometer = 1000 meter)

(1) Sherry's average speed during the bicycle ride was faster than 7 meters per second.
(2) Sherry's average speed during the bicycle ride was slower than 8 meters per second.
[Reveal] Spoiler: OA

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Re: During a certain bicycle ride, was Sherry's average speed faster than [#permalink]

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New post 23 Dec 2015, 20:57
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In speed /rate

if question stem gives m/sec , you can covert km/hr multiply by 18/5.

here how 18/5 .

vice versa , if we want convert from km/hr to m/sec multiply by 5/18.


statement 1:
greater than 7m/sec=7*18/5=

=126/5= greater than25.2km/hr.
sufficient.

statement 2 less than 8m/sec
<28.8km/hr

It can be greater than 24km/hr or less than 24km/hr. not sufficient.

Option A is correct.
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During a certain bicycle ride, was Sherry's average speed faster than [#permalink]

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New post 17 Feb 2016, 19:10
As both choices are in meters per second, one way to do this faster is to convert the value in question stem to same unit of measurement. 24 kmph = \(24*1000/(60*60)\) = 6.6 meters per second. Now the question becomes: Is speed faster than 6.6 m/s? Clearly, only choice A answers that.
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During a certain bicycle ride, was Sherry's average speed faster than [#permalink]

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New post 18 May 2017, 09:35
didn't read slower and chose D within 5 secs.


so (1) is sufficient anyway --> the questions is not whether it is actually true, just if we can figure it out

(2) statement 2 says < 28.8 so could be less than 24 but could also be greater


such a stupid mistake :(
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During a certain bicycle ride, was Sherry's average speed faster than   [#permalink] 18 May 2017, 09:35
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