# An Aeroplan is fl Let us consider the above problem, by the following diagram, where 'A' depicts the aero plane, 'C' and 'D' depict two ends of river.

Now,

Angle of depression from plane to 'C' = XAC = 45°

XAC = ACD = 45° = θ1(say) [Alternate angles]

Angle of depression from plane to 'D' = YAD = 60°

AP = Height at which aero plane is flying = 300 m   CP = 300 m     DP = 100√3 m

DP = 100(1.732)

DP = 173.2 m

Now, distance between two banks, CD = CP + DP

CD = 300 + 173.2 = 473.2 m

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