Tina can walk 2000 meters in 50 minutes. What is the unit rate?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8

Is triangle jkl congruent to triangle rst? if so, what is the scale factor?