The speed of a current is 6 mph. If a boat travels 62 miles downstream in the same time that it takes to travel 31 miles upstream, what is the speed of the boat in still water±

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You want to set up a system of equations using the variables you don't know. The boat speed B and the time it travels one way, T. The two equations will be for going upstream and downstream, both using d = r*t. Downstream: d = r*t --> 62 = (6 + B)*T Upstream: d = r*t --> 31 = (-6 + B)*T Then use what you know about solving systems to find B! Good luck, I hope this helps.