Angles of depression of two canoes are 57 degree and 70 degree from the top of a vertical cliff, the foot of ...

 

Angles of depression of two canoes are 57 degree and 70 degree from the top of a vertical cliff, the foot of which is on the same straight line as the two canoes (A and B). If the cliff is 15m high, calculate the distance between the 2 canoes.