document.write( "Question 1171113: During the rescue operations, the coast guard boat travel at a constant speed of 8
\n" ); document.write( "kilometers per hour in still water. In a river with unknown current, it takes the boat thrice as long to travel 64 kilometers upstream (against the current) than it takes for 64 kilometers return trip (with the current). What is the speed of the current?
\n" ); document.write( " Against the current (upstream)
\n" ); document.write( " 64- Distance
\n" ); document.write( " 8-x - Speed
\n" ); document.write( " 64 8−𝑥 - time
\n" ); document.write( " With the current (downstream)
\n" ); document.write( " 64 -Distance
\n" ); document.write( " 8+x -speed
\n" ); document.write( " 64 8+𝑥 - Time \n" ); document.write( "

Algebra.Com's Answer #796007 by Boreal(15235) $\"\"$ $\"About$

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time to go upstream is 64/(8-c) km/km/h =h
\n" ); document.write( "time to go downstream is 64/(8+c)
\n" ); document.write( "64/(8-c)=3*64/(8+c)
\n" ); document.write( "cross-multiply
\n" ); document.write( "512+64c=1536-192c
\n" ); document.write( "256c=1024
\n" ); document.write( "c=4 km/h\r
\n" ); document.write( "\n" ); document.write( "so it is 16 hours upstream and 5 1/3 hours downstream
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