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The time spent to study history and chemistry is 4 hours 30 minutes, Then the student studies physics for:

The time spent to study history and chemistry is 4 hours 30 minutes, Then the student studies physics for: Correct Answer 3 hours

$$\eqalign{& \text{Time spend in H + C} \cr& = \left(15 + 15 \right)\% \cr& = 30\% \cr& \text{Time spend in P = 20%} \cr& \because 30\% = 4\frac{1}{2} \text{H} = \frac{9}{2}\text{H} \cr& 1\% = \frac{9}{2} \times 30\text{H} \cr& \text{So, } 20\% = \frac{9}{2} \times \frac{20}{30}\text{H} = 3\text{ Hours} \cr& \text{So } 20\% = \frac{3}{20} \times 20 = 3\text{ Hours} \cr} $$

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