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# Joan walks 4 feet per second, which is half as fast as Al walks. If B

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Math Expert
Joined: 02 Sep 2009
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Joan walks 4 feet per second, which is half as fast as Al walks. If B [#permalink]

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29 Mar 2017, 05:07
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79% (00:39) correct 21% (00:39) wrong based on 109 sessions

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Joan walks 4 feet per second, which is half as fast as Al walks. If Bob is twice as fast as Al then how far will Bob walk in a minute?

A. 960 feet
B. 480 feet
C. 240 feet
D. 60 feet
E. 16 feet

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Re: Joan walks 4 feet per second, which is half as fast as Al walks. If B [#permalink]

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29 Mar 2017, 06:42
Joan walks at half the speed of Al. Hence, Al walks at twice the speed(8 ft/s) Since bob walks twice as fast as al. Al's speed will be 16 ft/s or 960 ft/minute (Option A)

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Re: Joan walks 4 feet per second, which is half as fast as Al walks. If B [#permalink]

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29 Mar 2017, 10:33
Bunuel wrote:
Joan walks 4 feet per second, which is half as fast as Al walks. If Bob is twice as fast as Al then how far will Bob walk in a minute?

A. 960 feet
B. 480 feet
C. 240 feet
D. 60 feet
E. 16 feet

Bob = 2 Al = 2 Joan
Al = 2*4 =8
Bob = 2*8=16 feet/min

Bob will walk 16*60 = 960 feet in a minute

Hence option A is correct
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Re: Joan walks 4 feet per second, which is half as fast as Al walks. If B [#permalink]

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29 Mar 2017, 14:05
Joan 4
Al 8
Bob 16

Bob = 60 x 16 = 960 Answer A
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Re: Joan walks 4 feet per second, which is half as fast as Al walks. If B [#permalink]

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31 Mar 2017, 12:36
Bunuel wrote:
Joan walks 4 feet per second, which is half as fast as Al walks. If Bob is twice as fast as Al then how far will Bob walk in a minute?

A. 960 feet
B. 480 feet
C. 240 feet
D. 60 feet
E. 16 feet

Since Joan’s rate is 4 feet per second and her rate is half of Al’s rate, Al’s rate is 8 feet per second. Since Bob’s rate is twice as fast as Al’s, his rate is 16 feet per second.

Finally, since 1 minute = 60 seconds, Bob will walk 16 x 60 = 960 feet in a minute.

Answer: A
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Re: Joan walks 4 feet per second, which is half as fast as Al walks. If B [#permalink]

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31 Mar 2017, 14:02
Bunuel wrote:
Joan walks 4 feet per second, which is half as fast as Al walks. If Bob is twice as fast as Al then how far will Bob walk in a minute?

A. 960 feet
B. 480 feet
C. 240 feet
D. 60 feet
E. 16 feet

Solution

• Joan walks at 4 feet per second.

• Joan walks half as fast as Al, which means,

o Joan $$= \frac{(Al)}{2}$$

o $$Al = 8$$ feet per second.

• Bob walks twice as fast as Al, which means,

o $$Bob = 2*Al$$

o $$Bob = 2* 8 = 16$$ feet per second.

• Distance traveled by Bob in a minute(60 seconds) $$= Speed * Time = 16 * 60 = 960$$ feet.

• Thus, correct answer is Option A.

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Saquib
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Re: Joan walks 4 feet per second, which is half as fast as Al walks. If B [#permalink]

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21 Apr 2017, 23:31
Bunuel wrote:
Joan walks 4 feet per second, which is half as fast as Al walks. If Bob is twice as fast as Al then how far will Bob walk in a minute?

A. 960 feet
B. 480 feet
C. 240 feet
D. 60 feet
E. 16 feet

Option:A
Time taken:0:59
Joan=4 ft/sec
Al=2*Joan
Bob=2*Al
Therefore
Al=8 ft/sec
Bob=16 ft/sec
(Please read the question carefully may be you trapped by option E here)
for finding per minute spreed of Bob
Bob=16*60=960 ft/min
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Joan walks 4 feet per second, which is half as fast as Al walks. If B [#permalink]

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26 Apr 2017, 14:36
Bunuel wrote:
Joan walks 4 feet per second, which is half as fast as Al walks. If Bob is twice as fast as Al then how far will Bob walk in a minute?

A. 960 feet
B. 480 feet
C. 240 feet
D. 60 feet
E. 16 feet

When there is just one conversion, here, from seconds to minutes, I find it faster to convert before calculating.

Joan is half as fast as Al => Al is twice as fast as Joan, and Bob is twice as fast as Al.

Start with Joan, convert her rate, multiply by 2, then multiply by 2 again.

Joan = $$\frac{4 ft}{1 sec}$$ x $$\frac{60}{60}$$ = $$\frac{240 ft}{60 secs}$$ = $$\frac{240 ft}{1 min}$$, times 2 =>

Al = $$\frac{480 ft}{1 min}$$, times 2 =>

Bob = $$\frac{960 ft}{1 min}$$ Answer A.
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Joan walks 4 feet per second, which is half as fast as Al walks. If B   [#permalink] 26 Apr 2017, 14:36
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# Joan walks 4 feet per second, which is half as fast as Al walks. If B

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