Physic
posted by Jimmy .
The back wall of an auditorium is 29.0 m from the stage. If you are seated in the middle row, how much time elapses between a sound from the stage reaching your ear directly and the same sound reaching your ear after reflecting from the back wall?

Physic 
drwls
0.29 m divided by the speed of sound.
You are 14.5 m from the stage and back wall. The reflected wave from the back must make a round trip of 0.29 m before reaching you. 
Physic 
AP
what is the speed of the sound

Physic 
drwls
About 340 m/s in air at room temperature. If you are studying acoustics, you should know it by now.
The subject is physics, not physic. Physic has another meaning. 
Physic 
Jimmy
i am not learning acoustics...but physics..sorry for the misspelling...i am sorry but i don't understand your approach
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