# What will be the Diameter? If

The time required for a boy to travel along the external and internal boundaries of a circular path are in the ratio 20:19. If the width of the path be 5 meters, the internal diameter is:

- 195 meters
- 192 meters
- 190 meters
- 180 meters

**Answer: (3) 190 meters**

**Explanation:-
**Let the internal radius of circular path = X m

Then, the external radius of the circular path = (X + 5 ) m

According to the question,

2 x pai x X/ 2 x pai x (X + 5) = 19/20

X/ (X + 5) = 19/20

20 X = 19 X + 95

20 X – 19 X = 95

X = 95

Then, the internal diameter of circular path = 95 cm

Therefore, diameter of the circular path =2 x 95

= 190 cm

Hence, the answer is (3) 190 cm.