A man in a boat crosses a river from point A If he rows perpendicular to the banks he reaches point C BC 120m in 10 min If the

Question

A man in a boat crosses a river from point A If he rows perpendicular to the banks he reaches point C BC 120m in 10 min If the man heads at a certain angle a to the straight line AB AB is perpendicular to the banks against the current he reaches point B in 12 5 min Find the width of the river w the rowing velocity u the speed of the river current v and the angle a Assume the velocity of the boat relative to water to be constant and the same magnitude in both case u B A

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