A bus moves from station A towards station B, which is at a distance of 189 km. An hour later, a car, the ratio of whose speed with the bus is 3 : 2, starts from station A and moves towards station B . Find the speed of the bus (in km/hr), if the car arrives at station B half an hour earlier than the bus.

A

41

B

37.8

C

42

D

63