Question

While filming an intense action sequence for the next James Bond movie, a controlled explosion detonates 1.3 km away from the actors. If the speed of sound through solid rock is 3000 m/s on average, the actors will feel the explosion before they hear it. How much time will pass between when they feel the explosion and when they hear it?

Answer 1

Time delay = time taken by wave to travel in air - time taken by solid

t = 1300 / 342 - 1300 / 3000

t = 3.3678 s