A car covers a certain distance at a uniform speed of $66\frac{2}{3}$ km per hour. How much distance will it cover in 9 hours?

Distance covered by the car in 1 h = $66\frac{2}{3}\mathrm{km}$
Distance covered by the car in 9 h =$\left(66\frac{2}{3}\times 9\right)\mathrm{km}$
=$\left(\frac{200}{3}\times 9\right)\mathrm{km}=\left(\frac{200\times 9}{3\times 1}\right)\mathrm{km}=\left(200\times 3\right)\mathrm{km}=600\mathrm{km}$

Hence, the distance covered by the car in 9 h will be 600 km.