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

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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
2
12
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

75% (01:12) correct 25% (01:14) wrong based on 659 sessions

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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.

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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
2
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
1
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
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1
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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Re: During a certain bicycle ride, was Sherry's average speed faster than  [#permalink]

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New post 21 Sep 2018, 08:44
Dear Moderator,
Please edit tag. This is sub-600.
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Re: During a certain bicycle ride, was Sherry's average speed faster than  [#permalink]

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New post 19 Oct 2018, 09:14
RSOHAL wrote:
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.


We take the minimum possible value as 7 (since it was faster than that if 7 satisfies it then anything above 7 will satisfy it)

\(\frac{7 meters}{sec} * \frac{60 secs}{min} * \frac{60 mins}{hour} * \frac{km}{1000 meter}\) = \(\frac{7 * 3600}{1000} = \frac{7 * 36}{10}\)

\(\frac{252}{10}= 25.2 > 24\) Sufficient.

Eliminate B/C/E

Statement 2)

slower than 8 means it could be 7 or 6 or any other number from this we cannot determine for sure.

So insufficient.

Answer choice A
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Re: During a certain bicycle ride, was Sherry's average speed faster than &nbs [#permalink] 19 Oct 2018, 09:14
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