Question 1197322
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Hi  
t = D/r
{{{100/(v+6) = 20/(v-6)}}}
100(v - 6) = 20(v+6)
   80v = 120 + 600
   80v = 720
     v = 9 mph, rate of rowing team in still water.
 checking:
 100/15 = 20/3  checks
Wish You the Best in your Studies.
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