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let the length of total distance is x
then,
3/5 of x = 3x/5
1/4 of x= x/4
1/x of x =x/8
then,
3x/5 +x/4 +x/8 +2=x
(24x+10x+5x+80)/40 = x
24x+10x+5x+80=40x
39x+80=40
80=40x-39x
80=x
then the total distance covered by a man is 80km
then,
3/5 of x = 3x/5
1/4 of x= x/4
1/x of x =x/8
then,
3x/5 +x/4 +x/8 +2=x
(24x+10x+5x+80)/40 = x
24x+10x+5x+80=40x
39x+80=40
80=40x-39x
80=x
then the total distance covered by a man is 80km
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