Answer:
T+S feet per minute.
Step-by-step explanation:
As the turtle and the snail are moving towards each other, their relative speed is calculated as the sum of each one's speed.
So, if the speed of the turtle is T feet per minute and the speed of the snail is S per minute, they are approaching each other at T+S feet per minute.
The time that would take them to meet each other is 200/(T+S) minutes.