Question

the wheel of a car are of diameter 140cm each how many complete Revolution does each wheel make 10 minute when the car is travelling at speed of 66 km per hour

Answer 1

Car is travelling at 66km/hr.

For 10min it should have travelled 11km. i.e 11x1000x100 cm.

Therefore the complete revolution required to cross the above distance is = 11x1000x100/(3.14x140)

= 2502.27 complete revolutions

Answer 2

here 10 minutes is equal to 1/6 hour

we know distance=speed*time

=>d=66*1/6

=>d=11km

here diameter od wheel is 140 cm.Hence radius will be 70cm

perimeter is 2πr

=>p=6.28*70

=>p=439.6cm

no.of roations = d/p

=>r=11*1000m/439.6cm

=>r=11000*100cm/439.6cm

=>r=2502.62

hence no.of complete rotations made by car is 2502