Diameter of the Wheel of the car = 80 cm.
Radius of the wheel = 40 cm.
Circumference of the Wheel = 2πr
= 2 x \(\frac{22}{7}\) x 40
= \(\frac{44\times 40}{7}\)
= 251.4 cm
Speed of the car = 66 km/hr.
= \(\frac{66\times 100000}{60}\)cm./min
= 110000 cm/min.
Distance travelled by car in 10 minutes
= 110000 × 10
= 1100000 cm.
Let the number of revolutions of the wheel be ’n’, then
n × 251.4= 1100000
∴ n = \( \frac{1100000}{251.4}\)
n = 4375
∴ Car can complete 4,375 revolutions in 10 minutes.
