Solving for speed and solving for time are similar in that they both involve writing a rate. In physics, speed is typically defined as the distance traveled divided by the time it takes to travel that distance.
The relationship can be expressed with the formula: \[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]
When solving for time, you can rearrange the formula to: \[ \text{Time} = \frac{\text{Distance}}{\text{Speed}} \]
In both cases, you're dealing with the concept of rates (speed being a rate of distance over time), and both rely on understanding the relationship among distance, speed, and time. This makes "They both involve writing a rate." the correct similarity.
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