question_answer

  Ranjeetha walks around the circular park in 15 min. If she walks at the rate of 5 km/h, 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 m                        

B)  200 m   

C)  250 m            

D)       300 m She would have to travel, at minimum, to reach the centre of the park = Radius of circular park In 15 min, she travels equal distance of perimeter of circular park Perimeter = Speed x Time             \[=\frac{5\times 1000}{60\times 60}\times 15\times 60\] \[=\frac{5000}{4}=1250\] According to the question, \[2\pi r=1250\] \[\Rightarrow \,\,r=198.86\approx 200\,m\]