A car finishes a journey in nine hours at the speed of 80 km/hr. If the same distance is to be covered in six hours how much more speed does the car have to gain?  Select the correct option.
A) 8 km/hr	B) 40 km/hr	C) 12 km/hr	D) 16 km/hr	E) None of these
Distance covered by the car = 80 × 9 = 720 km   \ Speed = 720⁄6 = 120 km/hr   \ Speed gain = 120 – 80 = 40 km/hr   Answer 40 km/hr
<result>B</result>
A car finishes a journey in nine hours at the speed of 80 km/hr. If the same distance is to be covered in six hours how much more speed does the car have to gain?