Question 778290
Let us suppose that he travelled x km on foot and y km on cycle.


So the total distance travelled is: {{{x+y=80}}} ________ (1)


Again, total time taken = time taken on foot + time taken on cycle

{{{8 = x/8 + y/16}}}
{{{128 = 2x + y}}} _______ (2)


Substituting for y from (1) in (2)
{{{128 = 2x + 80 - x}}}
{{{x = 48}}}

Therefore, {{{y=80-48=32}}}