A tap can fill a tank of 500 litres in 3 hours 30 minutes. In how much time will it fill one-fifth of the tank?

One-fifth of 500 litres of tank = (1 / 5) * 500 = 100 litres
Time taken to fill 500 liters = 3.5 hours
Time taken to fill 100 liters = (3.5 / 500) * 100
= 0.7hr
= 0.7 × 60 minutes
= 42 minutes

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