I am having a hard time with this question in my book, CollegePhysics by Serway/

Question

I am having a hard time with this question in my book, CollegePhysics by Serway/Vuille. I'm not sure where to start but Ithink the equation I use is: v = (331 m/s)T/ 273 K The question is: You are watching a peir being constructed on the far shore ofa saltwater inlet when some blasting occurs. You hear thesound in the water 4.50 s before it reaches you through theair. How wide is the inlet? Assume the air temp. is 20degrees C. I am having a hard time with this question in my book, CollegePhysics by Serway/Vuille. I'm not sure where to start but Ithink the equation I use is: v = (331 m/s)T/ 273 K The question is: You are watching a peir being constructed on the far shore ofa saltwater inlet when some blasting occurs. You hear thesound in the water 4.50 s before it reaches you through theair. How wide is the inlet? Assume the air temp. is 20degrees C.

Explanation / Answer

difference in time=distance travelled in air /speed of sound inair-distance travelled in water/sped of sound in water distance travelled in both media =x 4.50=x/v in air-x/v in water substituting the values of v in air and v in water we can get thevalue of x which ids the answer.

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