However, you can estimate the distance you can cover in 15 minutes by using an average human walking speed. The average human walking speed is generally considered to be around 3 miles per hour (mph) or 1.4 meters per second (m/s). To calculate how far you can walk in 15 minutes, you can use the following formula:

Distance = Speed × Time

where:

- Distance is in miles or meters

- Speed is in miles per hour (mph) or meters per second (m/s)

- Time is in hours or seconds

For example, to find how far you can walk in 15 minutes at an average walking speed of 3 mph (1.4 m/s):

- Convert the speed to m/s: 3 mph = 3 x 1609.34 / 3600 = 1.3411 m/s

- Calculate the distance: Distance = Speed × Time = 1.3411 m/s × 15 min × 60 s/min = 1196.97 meters (or approximately 0.74 miles)

Based on this calculation, someone with an average walking speed can cover a distance of about 1197 meters (0.74 miles) in 15 minutes. If the store is within this distance from the starting point and you maintain a steady walking pace, you can reach the store within 15 minutes.

Keep in mind that this estimation assumes an average walking speed and doesn't factor in any obstacles, traffic delays, or other potential hindrances along the way. To account for these factors, you may want to allow some additional time to ensure you reach the store within your desired timeframe.