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WebGraphing.com Forum » List all forums » Forum: Algebra, PreAlgebra, and Basic Math Homework Help » Thread: Distance, Rate, and Time 
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soto.a
United States Joined: Nov 30, 2010 Posts: 3 Status: Offline 
Deke's boat travels 12km/h in still water. Deke travels 45 km downstream and then returns 45 km upstream in a total time of 8 hours. Find the speed of the current. Help anyone?  Thanks ahead for the help :)! 


pskinner
Joined: Apr 2, 2005 Posts: 797 Status: Offline 
Let c=speed of current. d=r*t so, t=d/r Time upstream +Time downstream = 8: 45/(12+c)+45/(12c)=8 The rest is algebra: solve and get c=+ or  3.  Principal Skinner 


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