Question 426673
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Hi
Let x represent the speed of the current
Question states*** Note: D/r = t, total time is 14hrs
  45/(7-x) + 45/(7+x) = 14hr
 45(7+x) + 45(7-x) = 14(49-x^2)
  14x^2 +630 - 686 = 0
    14x^2 =  56
      x^2 =  4
       x = 2   (tossing out negative solution)
Speed of the current is 2kmph

CHECKING our Answer***
 45/9 + 45/5 = 5hr + 9hr = 14hr