Mr. Jones jogs the same route each day. The amount of time he jogs is inversely proportional to his jogging rate.

What option gives possible rates and times for two of his jogs?

1 answer

Since the amount of time Mr. Jones jogs is inversely proportional to his jogging rate, we can express this relationship mathematically as:

\[ \text{Time} \times \text{Rate} = k \]

where \( k \) is a constant.

To provide possible rates and times for two of his jogs, we need values for the time and rate that maintain this relationship. Let's assume the following pairs:

  1. Jog 1:

    • Rate: 4 miles per hour
    • Time: 30 minutes (0.5 hours)

    Here, \( k = 4 \text{ mph} \times 0.5 \text{ h} = 2 \text{ miles} \).

  2. Jog 2:

    • Rate: 6 miles per hour
    • Time: 20 minutes (1/3 hours)

    Similarly, \( k = 6 \text{ mph} \times \frac{1}{3} \text{ h} = 2 \text{ miles} \).

Both jogs yield the same value for \( k \), confirming the inverse relationship.

So, one possible set of rates and times is:

  • Rate: 4 mph, Time: 30 minutes
  • Rate: 6 mph, Time: 20 minutes