Speed equation

• A is driving on a highway when the police fines him for over speeding and exceeding the limit by 10 km/hr.At the same time B is fined for over speeding by twice the amount by which A exceeded the limit.If he was driving at 35 km/hr what is the speed limit for the road?
  
  Check my next post for answer of this question:
  
  
  
• Right answer of the last Puzzle is......
  
  
  A shopkeeper bought a watch for Rs.400 and sold it for Rs.500.What is his profit percentage?
  
  Profit is : 20%