SOLUTION: a river boat can travel at 20km per hour in still water. the boat travels 30km upstream against the current then turns around and trevels the same distance back with the current. i

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: a river boat can travel at 20km per hour in still water. the boat travels 30km upstream against the current then turns around and trevels the same distance back with the current. i      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 736344: a river boat can travel at 20km per hour in still water. the boat travels 30km upstream against the current then turns around and trevels the same distance back with the current. if the total trip took 7.5 hours, what is the speed of the current?
+30%2F%2820-x%29%2B30%2F%2820%2Bx%29=7.5+
+600%2B30x%2B600-30x=3000-7.5x%5E2+
+7.5x%5E2=1800+
+x=15.49+
this is what i`ve got..
Please tell me if I`m wrong...
Thank you
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
Your solution and your answer are correct.