Tourist, rafted down the river in a canoe, noticed

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Uploaded: 04.12.2016
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Description

Tourist, rafted down the river in a canoe, noticed that the stream carries it to the middle of the fallen and blocked the his wood path at a time when the distance from the nose kayak to a tree was 30 m. Assess what angle to the flow velocity, he must send a kayak, to get around the obstacle, if the flow rate of the river 3 km / h, the speed of a kayak in still water 6 km / h, the tree height of 20 m.

Additional information

Task 10978. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
If you have any questions about the decision to write. I try to help.

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