The number of rounds that a wheel of diameter 7/11 metre will make in traversing 4 km

Answer: (d) 2000

Solution:-
The diameter of a wheel  = 7/11
Therefore, the radius of the wheel = 7/2 x 11
 = 7/22 m 

Distance covered by wheel in a round = circumference of the wheel = 2 x pai x r
Then,  distance covered by wheel in a round = 2 x 22 x 7/7 x 22
 = 2 m 

So ,the number of rounds in traversing 4 km = 4000/2
 = 2000

Hence, the correct answer is option (d) 2000.