off the walkway: 4 ft/s speed of walkway: 2 ft/s
Work Step by Step
groundspeed is 2 f/s against walkway, 6 f/s with walkway $x-y = 2$ $x+y = 6$ $(x-y)+(x+y) = (2+6)$ $2x = 8$ $2x/2 = 8/2$ $x= 4$ $x-y=2$ $4-y=2$ $4-y-2+y = 2-2+y$ $2 = y$
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