6 pipes are required to fill a tank in 80 minutes. How long will it take if only 5 pipes of the same type are used?
Answer: 96 minutes
Explanation
For 6 pipes, it takes 1 hour 20 minutes
1 hour 20 minutes = 60+20 = 80 minutes
For 5 pipes, let the time taken be x.
This is inverse proportion case:
80 × 6 = x × 5
x = 480/5 = 96
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