At the end of the interview for my current job... (programmer) I was asked to solve "the river" math problem...
And provide the answer to the relative effect of the motion.
If you've never heard of it...
But - I did get it right... took 2 minutes...Rowing upstream, a man dropped a hat into the river. Ten minutes
later, he reversed direction, rowed downstream, and retrieved the
hat 1 km downstream from where he had dropped it. If the river
flows at a constant rate, and Pat rows at a constant rate (relative to
the river), what is the river’s rate, in km/hr?





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