A tugboat is travelling from Asaba to Onitsha across the River Niger with a resultant velocity of 20 knots…

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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