Question

the speed of sound in air is 320m/s and in water is 1600m/s. It takes 2.5 seconds for sound to reach certain distance from the source placed in air (1)find this distance(2) how much time will be taken for sound to travel same distance when the source is in water​

Answer 1

Vair=320m/s
Vwater=1600m/s
tair=2.5s
(1) from relation Vd/the
d=v×t
= 320×2.5m
=800m
(2)
In water V=1600 d=800
t=d/V
=800/1600
0.5s

Answer 2

Distance in air = speed in air * time
= 320*2.5
=800 metres

Distance in water = speed in water * time
So , time = distance/speed
=800/1600
=0.5 seconds