The magnitude and the direction the boat go, relative to the straight line
across it is 15.81 m/s and 18⁰ respectively.
Boat's resultant velocity
= √ ( 15² + 5² )
= √ ( 225 + 25 )
= √250
= 15.81 m/s
If boat makes angle θ with direction of flow of river
Tanθ = 15/5 = 3
θ = 72⁰ approx.
Angle with straight line across it = 90 - 72 = 18⁰
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