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6 pipes fill a tank in 1 hour 20 minutes. With 5 pipes the time is:
A96 minutes
B80 minutes
C100 minutes
D66 minutes
Answer & Solution
Correct answer: A. 96 minutes
1. Fewer pipes means more time.
2. 80 times 6 equals 5 times x.
3. x is 96 minutes.
_Source: NCERT Class 8 Mathematics, Chapter 13, Direct and Inverse Proportions._
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