A. B is 38 kilometers away from each other. A and B set out from both places at the same time and travel in opposite directions. A travels 8 kilometers per hour and B 11 kilometers per hour. A returns to a immediately after arriving at B, and B returns to B immediately after arriving at a. a few hours later, they meet on the way? How far is it from a when we meet?

A. B is 38 kilometers away from each other. A and B set out from both places at the same time and travel in opposite directions. A travels 8 kilometers per hour and B 11 kilometers per hour. A returns to a immediately after arriving at B, and B returns to B immediately after arriving at a. a few hours later, they meet on the way? How far is it from a when we meet?

38 × 3 ^ (8 + 11) = 114 ^ 19, = 6 (hours); 11 × 6-38 = 66-38, = 28 (kilometers)? When they met, they were 28 kilometers away from a

If the volume of water contained in the conical container is 1 / 27 of that of the container, what is the height of the water surface?
 

Let R be the bottom radius, H be the height and V be the volume
Then (1 / 3) * pi * R ^ 2 * H = v
If r = NR (x times of R, n can be any positive number)
Then (1 / 3) * pi * (NH) ^ 2 * H = V, that is, (1 / 3) * pi * (H ^ 3) * (n ^ 2) = v
The solution is h = 3 V / pi / (n ^ 2)]
When v = 1 / 27V is brought into the formula, H = 1 / 3H is obtained
So the answer is 1 / 3