Im not sure how to draw this and so i havnt been able to try and solve it yet, so if you could help me draw it and give a few hits that would be great thnx

A ship travelling with a constant speed and direction is signhted from a lighthouse.At this time it's 2.7kn away on a bearing of 42degrees. half an hour later it is ona bearing of 115degrees at a distence of 7.6 km from the same lighyhouse. find its speed in km per hour

thank you