Answer:
d = r * t
Explanation:
This is another one of those questions (there have been a lot lately) where what is wanted is not very clear. You want just the equation it would take to get the answer. Then you need the answer. There is a decimal involved but not much of one.
d ∝ h which means that d varies directly as h the time.
The constant of direct variation is r. This world class runner is going for 2 hours and in that time he goes 17 km.
d = r * h Answer. The question wants the equation.
17 = r * 2 Divide by 2
17/2 = r*2/2 Do the division
r = 8.5 km / hr. This is the numerical answer.