Final answer:
The correct way to describe Janelle's bike riding speed of 15 kilometers per hour in another form is 'Janelle can ride her bike 15 kilometers for every hour.'
Step-by-step explanation:
Another way of saying that Janelle can ride her bike at a rate of 15 kilometers per hour is 'A: Janelle can ride her bike 15 kilometers for every hour.' This phrase accurately describes her rate of movement in terms of distance over time. The question involves understanding units of speed, which is a mathematics concept often taught in middle school.
To further illustrate, consider an example where a car travels 150 kilometers in 3.2 hours. Its average speed, Vavg, is calculated as the distance traveled divided by the time taken, which is 150 km / 3.2 h, resulting in an average speed of 47 km/h. This example uses the same principle to understand rates of speed as the bicycle scenario with Janelle.