A hiker walks from base camp for 10km on a bearing of 50degrees, then walks further 14km on a new bearing of 140degrees........?

A hiker walks from her base camp for 10km on a bearing of 050degrees, and then walks a further 14km on a new bearing of 140degrees. There is then a thunderstorm, and she decides to return directly back to base camp.

a.) Find the distance and bearing of the return journey

b.) The hiker's speed is a constant 1.5m/s. If her return journey starts at 15:00, at what time will she arrive back?