A fisherman Can row upstream at 1mph and downstream 4 mph. He started rowing upstream until he got tired and then towed downstream

A fisherman Can row upstream at 1mph and downstream 4 mph. He started rowing upstream until he got tired and then towed downstream to his starting point. How far did the fisherman row if the entire trip took 6 hours?

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  1. area of part 1:

    a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

    area of part 2:

    a2=length*width=(8+2)*1=10 ft2

    area of part 3:

    a3=length*width=8*2=16 ft2

    total shaded area : a1+a2+a3=41 ft2

    total area of the reactangle : a=16*8=128 ft2

    total area of the nonshaded region : 128-41=87 ft2

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