# SOLUTION: A boat traveled 210 miles downstream and back. The trip downstream took 10 hours. The trip back took 70 hours. What is the speed of the boat in still water? What is the speed of th

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 Question 311408: A boat traveled 210 miles downstream and back. The trip downstream took 10 hours. The trip back took 70 hours. What is the speed of the boat in still water? What is the speed of the current?Answer by mananth(12270)   (Show Source): You can put this solution on YOUR website!distance traveled downstream = 210 miles Time taken = 10 hours downstream speed = 210/10 = 21 mph .. distance traveled upstream = 210 miles Time taken = 70 hours upstream speed = 210/70 = 3 mph let speed of boat in still water be x mph let speed of current be y mph . x+y=21 x-y=3 . add the two equations 2x=24 x=12 speed of boat in still water plug the value of x in any equation above y=9 mph speed of current