A boat which has a speed of 5m/s in still water crosses the river of width 25m in 10 seconds. The boat is heading at an angle of α with downstream, where α is equal to
A
150∘
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B
120∘
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C
90∘
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D
60∘
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Solution
The correct option is A150∘ t=wvsinθ⇒10=255sinθ sinθ=12⇒θ=30∘ ∴α=180∘−θ=150∘ ∴ (a)