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

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RSOHAL
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During a certain bicycle ride, was Sherry's average speed faster than [#permalink] New post   23 Dec 2015, 21:03
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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.
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A
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Re: During a certain bicycle ride, was Sherry's average speed faster than [#permalink] New post   23 Dec 2015, 21:57
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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] New post   17 Feb 2016, 20:10
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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] New post   18 May 2017, 10:35
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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] New post   21 Sep 2018, 09:44
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] New post   19 Oct 2018, 10:14
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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 [#permalink] New post   05 Apr 2019, 00:44
During a certain bicycle ride, was Sherry's average speed faster than 24 kilometers per hour? (1 kilometer = 1000 meter)

\(24 km/hour = 24 * 1000 m/hour = \frac{24000}{60} meters/ minute = \frac{24000}{3600} meters / second = \frac{20}{3}=6.67 m/s\)

New question stem Was was Sherry's average speed faster than 6.67 m/s

(1) Sherry's average speed during the bicycle ride was faster than 7 meters per second.

7 is greater than 6.67 m/s Sufficient

(2) Sherry's average speed during the bicycle ride was slower than 8 meters per second.
Yes if avg speed was slower than 8 but faster than 6.67
No, if avg speed is slower than 6.67

Not sufficient

Hence A
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Re: During a certain bicycle ride, was Sherry's average speed faster than [#permalink] New post   17 May 2020, 04:13
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.


S > 24 km/hr

24 km/hr = 20/3 = 6.67 m/s

Question: S > 6.67 m/s

1) S > 7 => Sufficient

2) S < 8 => Not Sufficient

ANSWER: A
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Re: During a certain bicycle ride, was Sherry's average speed faster than [#permalink] New post   15 Oct 2020, 05:30
(1) Sherry's average speed during the bicycle ride was faster than 7 meters per second.

7 * (18/5) = 25.2 km/hr

25.2 > 24. Sufficient.
(2) Sherry's average speed during the bicycle ride was slower than 8 meters per second.

Slower than 28.2 km/hr. Insufficient.

Answer is A.
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Re: During a certain bicycle ride, was Sherry's average speed faster than [#permalink] New post   27 Dec 2020, 15:09
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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.


(1) Converting 7 meters per second into kilometer per hour: 1*7/1000*60*60=25.2 kilometers, which is greater than 24 kilometers per hour. Sufficient.

(2) If take 5 meters per second then the result will be NO, But She can take 7 meters per second then the result will be YES. Insufficient.

The answer is A.
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Re: During a certain bicycle ride, was Sherry's average speed faster than [#permalink] New post   30 Jun 2021, 09:57
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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.

Solution:

Question Stem Analysis:

We need to determine whether Sherry's average speed is faster than 24 kilometers per hour.

Statement One Alone:

Since there are 3600 seconds in an hour, her speed is more than 7 x 3600 = 25,200 meters per hour or 25.2 km per hour. Statement one alone is sufficient.

Statement Two Alone:

Since there are 3600 seconds in an hour, her speed is less than 8 x 3600 = 28,800 meters per hour or 28.8 km per hour. Since her speed is less than 28.8 km per hour, it could be more than 24 km per hour, or it could be less than 24 km per hour. Statement two alone is not sufficient.

Answer: A
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During a certain bicycle ride, was Sherry's average speed faster than [#permalink] New post   21 Dec 2023, 19:04
Expert Reply
Video solution here (3:22):



2 Key Habits that are very often helpful:

1. Rephrase the DS stem! (Convert the units in the stem, right away)
2. "Simplify before Multiply!"

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