The speed of sound in air at 10°C is approximately 343 meters per second. Let's use the formula:
distance = speed x time
We want to find the time it takes for the sound to travel 210 meters to the top of the mineshaft. So we can rearrange the formula to solve for time:
time = distance ÷ speed
Plugging in the values we have, we get:
time = 210 ÷ 343
time ≈ 0.612 seconds
Therefore, it takes approximately 0.612 seconds for the sound to travel from the bottom to the top of the mineshaft.