document.write( "Question 824842: A motorboat travels 406 km in 7 hours going upstream and 936 km in 9 hours going downstream. What is the rate of the boat in still water and what is the rate of the current? \n" ); document.write( "
Algebra.Com's Answer #496819 by TimothyLamb(4379)\"\" \"About 
You can put this solution on YOUR website!
---
\n" ); document.write( "s = d / t
\n" ); document.write( "x = speed of boat in still water
\n" ); document.write( "y = speed of the water current
\n" ); document.write( "---
\n" ); document.write( "up:
\n" ); document.write( "x - y = 406/7
\n" ); document.write( "x - y = 58
\n" ); document.write( "---
\n" ); document.write( "down:
\n" ); document.write( "x + y = 936/9
\n" ); document.write( "x + y = 104
\n" ); document.write( "---
\n" ); document.write( "system of linear equations:
\n" ); document.write( "x - y = 58
\n" ); document.write( "x + y = 104
\n" ); document.write( "---
\n" ); document.write( "copy and paste the above standard form linear equations in to this solver:
\n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "x = speed of boat in still water = 81 kph
\n" ); document.write( "y = speed of the water current = 23 kph
\n" ); document.write( "---
\n" ); document.write( "Solve and graph linear equations:
\n" ); document.write( "https://sooeet.com/math/linear-equation-solver.php
\n" ); document.write( "---
\n" ); document.write( "Solve quadratic equations, quadratic formula:
\n" ); document.write( "https://sooeet.com/math/quadratic-formula-solver.php
\n" ); document.write( "---
\n" ); document.write( "Solve systems of linear equations up to 6-equations 6-variables:
\n" ); document.write( "https://sooeet.com/math/system-of-linear-equations-solver.php \n" ); document.write( "
\n" );