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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?
  1. 96 minutes
  2. 102 minutes
  3. 80 minutes
  4. 85 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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