Hi

length of the River A exceeds River B by 430 mi

Let x and (x+430mi) represent the lengths of B and A rivers respectively

question states*** 

  x  + (x+430mi)= 2790mi

slving for x

   2x = 2360mi

    x = 1180mi , length of River B, River A is 1610mi  (1180mi+430mi)



CHECKING our Answer

 1180mi + 1610mi = 2790mi 

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