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A 246-m-wide river flows due east at a uniform speed of 1.7 m/s. A boat with...

A 246-m-wide river flows due east at a uniform speed of 1.7 m/s. A boat with speed of 7.9 m/s relative to the water leaves the south bank of the river pointed in a direction 34.9 degrees west of north. How long does it take the boat to reach the other side of the river (in seconds)? Enter only the numerical part of the answer in the box.

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