The times required to travel a circular path of breadth 8 m along the outer and inner circumferences by a person by a bicycle are 23 sec and 21 sec respectively. Find the diameter of the inner circle of the path.

There is a path around a circular garden. The outer circumference of that path is 912 m and the inner circumference is 868 m. Find the breadth of the path.

The length of outer an inner diameter of a right circular cylindrical pipe open at two ends are 30 cm and 26 cm respectively and length of pipe is 14.7 metre. Find the cost of painting its all surfaces with coaltar at Rs 2.25 per dcm.

The breadth of a ractangle is 44 m, its length is 2(1)/(2) times of its breadth. Find the diameter of the circle, the circumference of which is equal to the perimeter of the rectangle.