Direction: In a city there are three bus routes 1, 2 and 3 between A and F. Route-1 has intermediate stops and at B and D. Route-2 has stops at C and D. The shortest route-3 with a length of 10 km, stops at C only, which is exactly at the middle of this route. The longest route has 3 km more length than the shortest one. The distances between C and D, B and D and F and D are 4, 3 and 2 kilometres respectively.