Squares and Square Roots
A boat left port and sailed due west for 2 hours at 10 mph, then sailed north for 3 hours. It didn't want to sail in a straight line to its destination, because it was trying to avoid another boat it dated a few months back. Awkward. The boat ended up 25 miles away from port as the crow flies (along a straight line). While the boat was sailing north, how fast was it sailing?