The time required for a boy to travel along the external and

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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:

[SSC GD 2015 With Answers]

A 195 metres

B 192 metres,

C 180 metres,

D 190 metres,