Let CE be the height of the tower. Let the angle of elevation of the top of the tower be α and the angle of depression of the foot of the lower be β.
tan α=52 and tan β=14 (given)
In ΔBDC
tan β=10x
14=10x
∴ x=40 m
In Δ BDE
tan α=hx
52=h40
h=100 m
∴ height of tower =h+10=100+10=110m