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d/r?

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d/r?

by grandh01 » Wed Aug 08, 2012 1:29 pm
A car traveled a distance of d miles
in t minutes at an average rate of r
miles per minute. What is the ratio of
d to r ?
(1) t = 30
(2) d = 25
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Source: — Data Sufficiency |
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by eagleeye » Wed Aug 08, 2012 1:54 pm
grandh01 wrote:A car traveled a distance of d miles
in t minutes at an average rate of r
miles per minute. What is the ratio of
d to r ?
(1) t = 30
(2) d = 25
Speed = distance/time => r = d/t => t = d/r. Hence if we can find t, we have d/r.

(1) t = 30
This tells us t. Sufficient.

(2) d = 25
We don't know t insufficient.

Hence A is right. :)[/img]
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