(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A boat whose speed in still water is 1.70m/s must cross a 260 meter wide river and arrive at a point 110 metres upstream from where it starts. To do so, the pilot must head the boat at a 45 degrees upstream angle. What is the speed of the river's current.

2. Relevant equations

According to my lecture, I believe the equation should be sin Theta = Vws/Vbs

Vws being the water's current, and Vbs the boat's speed. However, I don't know where the river's width comes in.

3. The attempt at a solution

Sin 45 = Vws/1.70 m/s

Vws = Sin 45 x 1.70

Vws = 1.20 m/s.

Would this be correct?

THANKS!

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# Finding a river's current

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