document.write( "Question 825017: a race boat covers a distance of 60 km downstream in one and a half hour. it covers this distance upstream in 2 hours. the speed of the race boat in still water is 35 km/hr. find the speed of the stream. \n" ); document.write( "

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a race boat covers a distance of 60 km downstream in one and a half hour.
\n" ); document.write( " it covers this distance upstream in 2 hours.
\n" ); document.write( "the speed of the race boat in still water is 35 km/hr. find the speed of the stream.
\n" ); document.write( ":
\n" ); document.write( "Let c = speed of the current
\n" ); document.write( "Write a time equation; time = dist/speed
\n" ); document.write( " $\"60%2F%28%28c%2B35%29%29\"$ = 1.5
\n" ); document.write( "60 = 1.5(c+35)
\n" ); document.write( "60 = 1.5c + 52.5
\n" ); document.write( "60 - 52.5 = 1.5c
\n" ); document.write( "7.5 = 1.5c
\n" ); document.write( "c = 7.5/1.5
\n" ); document.write( "c = 5 km/hr is the rate of the current
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check it in the upstream trip
\n" ); document.write( " $\"60%2F%28%2835-5%29%29\"$ = 2 \n" ); document.write( "

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