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What is the resultant speed of the boat?

A small boat moving west at a speed of 30 km/hr is crossing a river that is flowing south at a speed of 15 km/hr. What is the resultant speed of the boat? I have no idea how to solve this. Could you please walk me through it, using the simplest terms possible?

Public Comments

1. <---------boat l ........../ l........./ l......./ resulant speed l ..../ l.../ \// now just use pythagrian theorem a^2 + b^2 = c^2 15^2 + 30^2 = c^2 now just solve for c hope this helps