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When one quantity rises and the other falls, they are in:
ADirect proportions
BEqual proportions
CFixed proportions
DInverse proportion
Answer & Solution
Correct answer: D. Inverse proportion
1. Speed and time for a fixed distance behave this way.
2. One going up pushes the other down.
3. Such quantities are in inverse proportion.
4. So the answer is inverse proportion.
_Source: NCERT Class 8 Mathematics, Ch 11 'Direct and Inverse Proportions'_
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