document.write( "Question 1121999: the total distance travelled by a boat 1 hour upstream and 30 minutes donwstream in which the rate of current is 3kph \n" ); document.write( "
Algebra.Com's Answer #738035 by ankor@dixie-net.com(22740)\"\" \"About 
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the total distance travelled by a boat 1 hour upstream and 30 minutes downstream in which the rate of current is 3kph
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\n" ); document.write( "Let s = the boat speed in still water
\n" ); document.write( "then
\n" ); document.write( "(s-3) = effective speed upstream
\n" ); document.write( "and
\n" ); document.write( "(s+3) = effective speed downstream
\n" ); document.write( ":
\n" ); document.write( "Change 30 min to .5 hr, write a dist equation, dist = time * speed
\n" ); document.write( "dist up = dist back
\n" ); document.write( "1(s-3) = .5(s+3)
\n" ); document.write( "s - 3 = .5s + 1.5
\n" ); document.write( "s - .5s = 1.5 + 3
\n" ); document.write( ".5s = 4.5
\n" ); document.write( "Multiply both sides by 2
\n" ); document.write( "s = 9 k/h is the speed in still water
\n" ); document.write( "Find the one way distance
\n" ); document.write( "1(9-3) = 6 km
\n" ); document.write( "Find the total dist up and back: 2 * 6 = 12 km \n" ); document.write( "
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