Man A is sitting in a car moving with a speed of 54 km/hr observes a man B in front of the car crossing perpendicularly a road of width 15 m in three seconds. Then the velocity of man B (in m/s) will be:
(A) 5√10 towards the car at some angle
(B) 5√10 away from the car at some angle
(C) 5 perpendicular to the road
(D) 15 along the road