document.write( "Question 206088: 4. Rita rows 12 km upstream and 12 km downstream in 3 hours. The speed of her boat in still water is 9 km/hr. Find the speed of the stream. \n" ); document.write( "
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sol:
\n" ); document.write( "speed=distance/time
\n" ); document.write( "according to the question
\n" ); document.write( "speed of upstream=distance/time=12/3=4km/hr
\n" ); document.write( "according to the question speed of boat in still water=9 km/hr
\n" ); document.write( "let speed of stream= x km/hr
\n" ); document.write( "now speed of upstream=speed of boat in still water-speed of stream
\n" ); document.write( "substitute above values in this formula ,we get
\n" ); document.write( "4km/hr=9 km/hr-x
\n" ); document.write( "transposing x from R.H.S to L.H.S and 4 from L.H.S to R.H.S
\n" ); document.write( "x=9 km/hr-4 km/hr= 5km/hr
\n" ); document.write( "speed of stream=5 km/hr
\n" ); document.write( "check:speed of upstream=4km/hr
\n" ); document.write( "speed of upstream=speed of boat in still water-speed of stream
\n" ); document.write( " =9 km/hr- 5 km/hr=4 km/hr
\n" ); document.write( "L.H.S= R.H.S (as requried)\r
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