Question

If a certain wheel turns at a constant rate of x revolutions per minute, how many revolutions will the wheel make in k seconds ?

• A. $\frac{kx}{60}$
• B. $\frac{x}{60k}$
• C. $kx$
• D. $x-k$
• E. $60kx$

Hint:

Always align the units of rate and time before multiplying. If rate is per minute and time is in seconds, divide the rate by 60 to convert it to a per-second baseline.

Answer 1

The Correct Option is A

Step 1: Standardize the units of time.
The rate is given as $x$ revolutions per minute.
Since 1 minute = 60 seconds, the rate per second is $\frac{x}{60}$ revolutions/second.

Step 2: Calculate total revolutions.
Total revolutions = Rate per second $\times$ Total seconds
Total revolutions = $\frac{x}{60} \times k = \frac{kx}{60}$.