A car travelling at a constant speed covers 585 km in 9 hours. In how much time will it cover 520 km?

We know :  Speed = $\frac{\mathrm{Distance}}{\mathrm{Time}}$

And given : A car travelling at a constant speed covers 585 km in 9 hours. So

Speed of car = $\frac{585}{9}$ = 65 km/ hr

Then ,

Total time will it cover 520 km = $\frac{520}{65}$ = 8 hr                                           ( Ans )