A and B are two cities 100km apart. The compass bearing of B from A is S30E. At noon Andrew and Billy ride bicycles and leave cities A and B respectively.
Andrew rides due south at a speed of 15km/h. while Billyrides due north at a speed of 18km/h. Find the compass bearing of Billy from Andrew at 2:00p.m. Ccorrect nearest 0.1degree)