Ncert book, class 7th, exercise no.6.3, question 2 A part not able to understand. please explain​

The distance between two points is 6.5cm and scale of map is 1: 1000 what's the distance between the two points

What are the solutions of the following system? y=-2x^2 y=x-2

Two trains leave stations 546 miles apart at the same time and travel toward each other. one train travels at 95 miles per hour while the other travels at 115 miles per hour l. how long will it take for the two trains to meet