A boat on a river travels the same distance in 1/2 hour downstream as it can go upstream for an hour. If the boat travels 12 mph in still water, what is the speed of the current?

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Let the distance=x miles which is same for downstream and up streamit takes 1/2 hr in down stream .so the speed in down stream is =distance/time=2x  mi/hrThe speed of the boat in still water is=12 mi/hr (given)Let y be the speed of the currentIn down stream  12+y=2xIn upstream the speed is x/1=x mi/hrSo the equation is 12-y=xSolving the equations you get x=8miY=4 mi/hr