Question

Hima Das runs at a speed of 4 m/s. If she covers a circular track of 70 m radius, then find the time taken by her to complete the circular track. 

1. 100 seconds
2. 200 seconds
3. 90 seconds
4. 110 seconds

Answer 1

Correct Answer - Option 4 : 110 seconds

Given: 

Speed of Hima Das = 4 m/s 

Radius of circular Track = 70 m 

Formula Used: 

Circumference of Circular Track = 2πR

Distance = speed × time 

 Calculation:

Distance covered by Hima Das = circumference of circular track 

Distance = 2 × (22/7) × 70 = 440 m

⇒ 440 = 4 x time 

⇒ time = 110 sec

∴ Time taken by Hima Das to complete the circular track is 110 sec.