Gita is facing a wall with a microphone (O) between her and the wall. She begins to clap and microphone detects two sounds. The distance between her and the microphone is 200 m and the distance between her and the wall is 500 m. What is the time interval between both the sounds, if the speed of sound is 330 m/s?
A1.51 s
B0.909 s
C1.81 s
D0.303 s
In solution, sound 2 is given 700m , but it should be 800m , plz explain