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:

Question

PYQPulse · Accepted Answer

190 metres

PYQPulse · Answer

Explanation: Let internal radius of the path be r m and thus external radius = (r + 5) m As, distance ∝ time => 2π(r+5) 20 2πr = 19 => 19r + 95 = 20r => 20r − 19r = r = 95 ∴ Internal diameter = 2 × 95 = 190 m => Ans - (D)

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:

Answer: D. 190 metres

Explanation

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:

Answer: D. 190 metres

Explanation