Question

The wheels of the car are of diameter $140cm$ each. How many complete revolution does each wheel make in $10$ minutes when the speed of the car is $66km/hr$.

Answer 1

Convert $66kmph$ into $m/s$ i.e $66\times \frac{5}{18}=\frac{55}{3}m/sec$

Now, Distance covered in $10min=(\frac{55}{3}\times 10\times 60)m=11,000m.$

distance covered in one Revolution $=(\frac{22}{7}\times \frac{140}{100})m\Rightarrow 4.4m$

No. of complete Revolution in $=\frac{11000}{4.4}=2500.$

Hence, this is the required solution.