SOLUTION: A river is flowing downstream at the rate of 2 km/h. Murray can swim at a rate of 3 km/h. Murray jumps in and swims downstream for a certain distance than turns around and swims up

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Question 845925: A river is flowing downstream at the rate of 2 km/h. Murray can swim at a rate of 3 km/h. Murray jumps in and swims downstream for a certain distance than turns around and swims upstream back to the start. In total it takes 30 minutes. How far did Murray swim downstream?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Since the current adds to his speed and
then subtracts the same amount, you can
disregard the current
+d+=+r%2At+
Convert 15 min to hrs ( time to swim downstream )
+15%2A%28+1%2F60+%29+=+1%2F4+ hrs
+d+=+3%2A%281%2F4%29+
+d+=+3%2F4+ km downstream