Dear Ram, so here it goes-

Speed of car on the road , v = 36km/h

= >36 × 5/18 = 10m/s

coefficient of friction between tires and road =0.5

Let radius of car is r

use formula, v=squareroot(u*r*g)

where g is acceleration due to gravity and u is coefficient of friction.

10×10 = 0.5 × r × 10 [taken g = 10m/s² ]

r = 20m

hence, minimum turning radius of car is 20m.

All the best

Hope this helps