Two men walk at rates of 6 miles per hour and 10 miles per hour respectively. they started from the same place walking in opposite directions. in how many hours will they be 200 miles apart?

12.5 hours.

Step-by-step 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 ÷ 16 = 12.5 hours.

After 12.5 hours they would be 200 miles apart.