A boat, whose speed in still water is 2.50 m/s, must cross a 285-m-wide river and arrive at a point 118 m upstream from where it starts (Fig. 3-45). To do so, the pilot must head the boat at a $45.0^\circ$ upstream angle. What is the speed of the river's current?
Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.