Hi

Let x and c represent rate of boat and current respectively

Question states*** D = r*t OR r = D/t

 x + c = 60mi/1hr

 x - c =  60mi/2hr



 x + c =  60mph

 x - c =  30mph

 2x = 90mph

  x = 45mph, speed of the boat

  45mph + c = 60mph

          c = 15mph, the rate of the current  

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