JAMB 1980
A tugboat is travelling from Asaba to Onitsha across the River Niger with a resultant velocity of 20 knots. If the river flows at 12 knots, the direction of motion of the boat relative to the direction of water flow is
A. 36.87°C
B. 53.13°C
C. 90°C
D. 136°C
E. 143.13°C
Correct Answer: Option B
Explanation
θ = cos^-1(12/20)
θ = 53.13°C
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