Relative Velocity Resultant velocity and Time to Cross river

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Understand velocity diagram. Solve Triangle using cosine law and/or sine law
A boat is capable of 20 km/h in still water. You wish to cross the river downstream so that the angle the boat’s push makes with the bank is 50.
At what angle to the bank should the boat steer if the current is 8 km/h? How long will it take you to cross the river 1.7 km wide?
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lovely solution. I tried and got the same answer!

gurmenbadyal