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In a river of 20 m width. Half part of r...

In a river of 20 m width. Half part of river flows with speed `10 m//sec` and remaining half part flows with `20m//sec` as shown in figure. A man starts to swim from A and reaches to point B in 10 sec. Man swims with speed `V_m` with respect to river at an angle `theta` with line AB. Then, angle `theta` will be : (man swims with constant speed and in same direction with respect to river throughout the motion):

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