A boy goes to school at a speed of 3 km/h. He returns at a speed of 5 km/h. He takes a total of 4 hours for both going to school and returning. The distance (in km) between his home and school is:
The following pie chart shows the different specialists in ABC hospital during the year 2021–2022. Study the pie-chart and answer the question.
If the total number of all these specialists was 60, then how many ENT specialists were there in the hospital?
If m, v and u, respectively, represent magnification, image distance and object distance, then the correct relation between m, v and u for a lens will be: