You are at Quincy Quarries Reservation with your grandfather, performing the activity described in the opening storyline. The coordinates of your position beside your grandfather when he claps his hands are N 42.244 34, W 71.033 78. Your smartphone stopwatch tells you that the time interval between the clap and the echo is 0.47 s. When you walk to the cliff, your coordinates are N 42.244 06, W 71.034 66. What speed of sound do you report to your grandfather (in m/s)? (Hint: The distance between your grandfather and the cliff is 78.8 m.)