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Rajneetha walks around the circular park in 15 minutes. If she walks at the rate of 5 km/hr, how much distance would she have to travel, at the minimum, to reach the centre of the park from any point on its perimeter?
  • a)
    100 metre
  • b)
    200 metre
  • c)
    250 metre
  • d)
    300 metre
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Rajneetha walks around the circular park in 15 minutes. If she walks a...
Time = 15 minutes
= 15 x 60 sec = 900 sec
Speed = 5 km/hr
= 5 x 5/18 m/sec
= 25/18 m/sec
Now Perimeter of the circular park = D
= S x T
= 25/18 x 900
2πR = 1250 metre
R = 1250 x 7/2 x 22 = 8750/44
= 198.86 metres
∴ Required minimum distance to reach the centre of the circle = 200 metre (approx)
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