If the relationship between distance y in feet and x in seconds is proportional, which rate is represented by x/y=0.6?

If the relationship is proportional, then we know that

('y' feet) = (rate) times ('x' seconds).

Divide each side by 'x' : y ft / x sec = rate

Take the reciprocal of each side: x sec / y ft = 1 / (rate)

You said that x sec / y ft = 0.6.

So 1/rate = 0.6 sec / ft.

Rate = (1 and 2/3) ft/sec.