Question

You watch distant Sally Homemaker driving nails into a front porch at a regular rate of 1 stroke per second. You hear the sound of the blows exactly synchronized with the blows you see. And then you hear one more blow after you see the hammering stop. How far away is she?

Answer 1

Answer: 343meters away

Explanation:

The velocity of sound in air is approx 343m/s

SO,

Velocity = distance/time taken.

The time taken is 1second only.

Distance = velocity × time

Distance = 343 × 1 = 343meters.