i need help

3.Jacob is waTching The opera one evening and The fire alarm sounds. The alarm is coming from Two speakers siTuaTed 1.25 m aparT aT The fronT and The cenTre of The TheaTre aT a frequency of IOOOHz. Jacob is seaTed aT The cenTre of The TheaTre several rows back and geTs up To exiT. As Jacob moves To The righT along his row He noTices The sound of The alarms increasing and decreasing. AfTer Jacob has moved 6.8m, he noTices The sound has decreased for a Third Time since he lefT his seaT aT The cenTre, The speed of sound is 344 m/s. Did Jacob buy expensive TickeTs?? (ie. How far back is he siTTing from The fronT?) 1.25m IMO c 7 3.00 x 10\" rm's Have a QUESTION? Go to link of meet provided in chat REMEMBER T0 DRAW AND FULLY LABELLED DIAGRAMS WITH: 0 LABELS(L,x,d, ...... ) o MAGNITUDE 0 UNITS - INCLUDE A SUMMARY SENTENCE 0 MAKE DIAGRAMS A REASONABLE SIZE and show work