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 metres, the internal diameter is :

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 metres, the internal diameter is :
1). 195 metres
2). 192 metres
3). 180 metres
4). 190 metres

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