Within a square ground with one side 20 m , there is a square path that is 4 m in breadth. What is the area of the park without the path

144 m^{2}

400 m^{2}

16 m^{2}

not determined

Correct Answer : C

If a ration shop is to be set up within 3 km of each city, how many ratio shops will be required?

The distance between the points (-4, 5) and (-4, -15) is

The distance between the points (-7, 5) and (-7, -20) is