Vikram travel a certain distance from point X to Y with a speed S kmph. If he travels the same distance with a speed (S+12) kmph, he reaches his destination 1 hour before. But if he travels with a speed of (S – 4) kmph, he reaches 30 min late. Which of the following values we can find from the given conditions. 
A) Speed of Ram, who can travel the same distance in 3 hours 
B) Speed of Vikram, when he reaches 30 minutes late 
C) Distance between X and Z, if Z lies in between X and Y 
D) Value of S