True, I'm not the best when it comes to science, but I'm pretty sure it's this
The speed of sound at sea level is 340.29 m/s (meters per seconds).
Answer:

Explanation:
Here two charges are placed at distance "d" apart
now the net value of electric field at some position between two charges will be ZERO
so we will have
electric field due to charge 1 = electric field due to charge 2

Let the position where net field is zero will lie at distance "r" from q1

now we will have

now square root both sides

now we have

so we have
