Question

Two fire towers, A and B, are 20.3 km apart. From tower A, the compass heading for tower B is S80E. The ranger in each tower sees the same forest fire. The heading of the fire from tower A is N50E. The heading of the fire from tower B is N60W. How far, to the nearest tenth of a kilometre is the fire from each tower?
The answer is 7.4 and 16.5 but I don't know how to get it??
see Damon's solution in the related questions below.

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