Two hockey pucks are sliding along the ice, towards the same goal, one directly in front of the other. The hockey puck in front has a mass of 0.170 kg, and is moving towards the goal at a speed of 6.0 m/s. The hockey puck in the rear has a mass of 0.155 kg, and is moving towards the goal at a speed of 11 m/s. After the rear puck collides with the front puck, the rear puck has a speed of 7.5 m/s. What is the speed of the front puck after the collision?
A. 9.2 m/s
B. 2.7 m/s
C. 9.5 m/s
D. 1.6 m/s