Question

an echo returned in 6sec .calculate tha distance of tha reflecting surface .given speed of sound in air 344m/s.

Answer 1

given ,
    time= 6 seconds
     speed of sound in air= 344 m/s
as the time 6 second is an echo so it is the double of the original time taken .
so the original time taken is 6/2=3 seconds

distance= speed * time
= 344*3
=      1032 m

Answer 2

V = 2d/t [formula]

Given :
V = 344
d = ?
 t = 6


Solution :

V = 2d/t
344 = 2d/6
344 = d/3 [division]
1032 = d [cross multiplication]

Final answer : 1032m


                                  Hope it helps...............