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Which pair is NOT in direct proportion?
AArticles and cost
BSpeed and time
CPens and cost
DWeight and cost
Answer & Solution
Correct answer: B. Speed and time
1. Cost rises with pens, weight or number of articles.
2. Speed and time for a fixed distance move oppositely.
3. So speed and time are not in direct proportion.
4. The answer is speed and time.
_Source: NCERT Class 8 Mathematics, Ch 11 'Direct and Inverse Proportions'_
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