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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
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B
15 minutes
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C
12 minutes
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D
10 minutes
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Solution

The correct option is B $$15$$ minutes
Given $$\dfrac{4}{5}$$ 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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