Water speed: 5.5 Current speed: 1.5
Work Step by Step
Let call "w" be speed of water and "c" be speed of the current Given: w-c=4 (headwind) w+c=7 (tailwind) Elimination method: (w-c)-(w+c)=4-7 => (w-w)-2c=-3 => c=1.5 w=7=1.5=5.5
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