- Two circle with ceteres o and on intersect at two points A and B, intersecting the circle at P and Q. Prove that PQ=200'
place a and b are 80 kilometre apart from each other on a highway a car starts from a and another from b at the same time if they move in same direction they meet in 8 hour and if they move towards each other they meet in 1 hour 20 minutes find the speed of cars