Answer: 0.395 Km from the hole was Martin when he started.
Step-by-step explanation:
Let be K the distance to the hole when Martin started
We are told that first the ball traveled 4/5 of K
Then the ball has yet to go:
K - 4K/5 = (5K - 4K)/5 = K/5
We are told that K/5 = 79m
Then K = 5*79m = 395m
We know 1Km = 1,000m
Then 395m*1km➗1,000m = 0.395 Km
Answer: 0.395 Km from the hole was Martin when he started.