A wheel makes 4000 revolution is covering a distance of 60 km. The radius of the wheel is:

2.39 m

1 km = 1000m                         

60 km = 60,000m

Then,  

Distance covered = no. of revolution

60000m = 4000 R

1R = 15m

Now,                                                                       

1Revolution =  2\(\pi \)r 

2\(\pi \)r  = 15m

2 × \(\frac{22}{7}\) × r = 15

r = \(\frac{15}{2}\) × \(\frac{7}{22}\)

r = 2.39m