The following pie chart shows the study time of different subjects of a student in a day.

If the total time spent to study History and Chemistry is 4 h 30 m, then the student studied Physics for:

3 h

The total time spent to study History and Chemistry is 4 h 30 m or = 270 minutes

Let the total time = 100%

History + Chemistry = 15% + 15% = 30%

given time for physica = 20%

So, the student studied the Physics for = \(\frac{270}{30}\) × 20 =

180 minutes or 3 hours