Distance covered by the car = 50 × 10 = 500 km
\ Speed = 500⁄5 = 100 km/hr
\ Speed gain = 100 – 50 = 50 km/hr
A car finishes a journey in ten hours at the speed of 50 km/hr. If the same distance is to be covered in five hours how much more speed does the car have to gain?

1. 8 km/hr
2. 10 km/hr
3. 12 km/hr
4. 16 km/hr
5. 50 km/hr