Here's a problem to solve: Franklin wants to know how fast he runs different distances. He uses a stopwatch to measure the time it takes him to complete a 50-meter, 100-meter, and 200-meter race. How can he calculate his speed for each race?

Among the 4 following options, which is the correct answer?

- A: Add the distances and the times.
 
- B: Divide the distances by the times.
 
- C: Multiply the distances by the times.
 
- D: Subtract the distances from the times.
 