A car can cover S km when travelling with P km per hour more than its original speed in 2 hours. It takes 3 hours to cover 20 km less distance when the car travel with P km per hour less than its original speed. Find the original speed of the car.
I) ( S - 2P) / 2
II) (S - 20 + 3P) / 3
III) (5P - 20)
1
Only I and II
2
Only II and III
3
Only I and III
4
All I, II, and III
5
Only III