document.write( "Question 103137: a motorboat covers a certain downstream in a river in 5 hours it covers the same distance upstream in five hour and a half the speed of the water is 1.5 km. find the speed of the boat in still water. \n" ); document.write( "
Algebra.Com's Answer #75053 by edjones(8007)\"\" \"About 
You can put this solution on YOUR website!
d=ts d=distance t=time, s=speed
\n" ); document.write( "ts=ts
\n" ); document.write( "5(s+1.5)=5.5(s-1.5)
\n" ); document.write( "5s+7.5=5.5s-8.25
\n" ); document.write( "15.75=.5s add -5s+8.25 to each side.
\n" ); document.write( "divide each side by .5
\n" ); document.write( "s=31.5 km/h
\n" ); document.write( "Always check:
\n" ); document.write( "5*33=165 km
\n" ); document.write( "5.5*30=165 km
\n" ); document.write( "Ed
\n" ); document.write( "
\n" );