Question

# If $$\cfrac{4}{5}$$ of a water tank is filled in $$1$$ hour, how much time will be required to fill the rest of it?

A
20 minutes
B
15 minutes
C
12 minutes
D
10 minutes

Solution

## The correct option is B $$15$$ minutesGiven $$\dfrac{4}{5}$$ of a water tank is filled in $$1$$ hr i.e. $$60$$ mins.The rest of the tank i.e. $$1-\dfrac{4}{5}=\dfrac{1}{5}$$ of the tank will be filled in $$\dfrac{60}{\tfrac{4}{5}}\times\dfrac{1}{5} =\dfrac{60}{4}=15$$ mins.Mathematics

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