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asloudascanbe

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**[SOLVED] How far downstream has the boat moved?**

I can't figure out the last part of this question. It's probably very simple and I'm just over looking it. The answers in part A are right. I just don't know how to get part B.

A river flows due east at 1.80 m/s. A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 9.0 m/s due north relative to the water.

(a) What is the velocity of the boat relative to shore?

9.178 m/s

78.69° (north of east)

(b) If the river is 400 m wide, how far downstream has the boat moved by the time it reaches the north shore?

m