If A = and B is the inverse of A, then the value of is
2
0
5
4
C.
5
OA and OB are two roads enclosmng an angle of 120°. X and Y start from 'O' at the same time. X travels along OA with a speed of 4 km/h and Y travels along OB with a speed of 3 km/h.The rate at which the shortest distance between X and Y is increasing after 1 h is
37 km/h
13 km/h