The diameter of the wheel of a car is 84 cm and the speed of car is 72 km/h. The no. of revolutions…

Circumference of wheel $= \pi d = \frac{22}{7} \times 84 = 264\text{ cm} = 2.64\text{ m}$. Distance covered in 11 minutes at $72\text{ km/h} = 20\text{ m/s}$ is $20 \times 11 \times 60 = 13200\text{ m}$. Number of revolutions $= \frac{13200}{2.64} = 5000$.