Question

Solve this please.
its urgent.​

Answer 1

$\large\purple{Physics}$

⭕ If Sound travels directly from A to B, time of travel t1 = x/v ......................(1)

where x is ditance between A and B. v is speed of sound.

If sound takes path A-C-B, time of travel t2 = { 2 [ (x2 /4) + h2]1/2 } / v

we have t2 -t1 = 1

...............⭐↪️ Attachment ↩️⭐.........

Option 4 is correct ✔️