Question

a motorboat takes 4 hours to travel 256miles going up stream. the return trip takes 2 hrs going downstream. what is the the rate of the boat in still water and what is the rate current.

rate of the boat in still water = mi/hrs

rate of the current=mi/hrs.=
speed upstream=256/4=64
speed downstream=256/2=128
rate of boat=128+64/2=96mi/hrs
rate of current=128-64/2=32mi/hrs

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