Answer:
12.5 hours.
Explanation:
First man walks in one hour = 6 miles
Second man walks in one hour = 10 miles
Since they are walking in opposite direction so distance between them after 1 hour = 6 + 10 = 16 miles
Since after one hour they are 16 miles apart from each other
Therefore, they will be 200 miles apart from their starting point
= 200 รท 16 = 12.5 hours.
After 12.5 hours they would be 200 miles apart.