Why this code not gives expected output

Question

var depth = parseInt(readLine(), 10);
//your code goes here
var days = 0;
var dist = 0;

while (dist <= depth) {
dist +=7
if(dist<depth)
dist -=2

days++

}

console.log(days);

Answer 1

Why is it dist <= depth and not dist < depth?

Answer 2

What will happen if depth is 6?