Question

A car has wheels which are 80 cm in diameter. How many complete revolutions does each wheel make in 10 minutes when the car is moving at a speed of 80 km per hour?

Answer 1

Distance covered in 1 revolution = Circumference of wheel

= 2πr

= 2 × π × 40

= 80π cm

Now, we find total distance covered

We know that,

⇒ Distance = 13.33 km

= 13.33 × 1000 m

= 1333.3 m

= 1333.3 × 100 cm

= 1333333.3 cm

Now,

= 5303.02

= 5303 (approx.)

Hence, number of revolutions = 5303