Jeremy shouts in front of a hill. He hears the echo 1.8secs later. The v of sound in air is 300ms-1. What is the distance btw Jeremy and the hill ?

Why is the answer 297 instead of 594 ?

Question

Jeremy shouts in front of a hill. He hears the echo 1.8secs later. The v of sound in air is 300ms-1. What is the distance btw Jeremy and the hill ?

Why is the answer 297 instead of 594 ?

lastdaywork · Answer

I think you simply used -
distance = velocity * time

Please note that the sound wave made a two way trip.

mrnood · Answer

It's neither of those
velocity = distance/time
distance = velocity * time = 300*1.8
The echo has to travel to hill and back again
Check your calculations

anonymous · Answer

Owhhh right two ways ! Missed that out. Thanks :)

lastdaywork · Answer

:)

mrnood · Answer

but  300*1.8 = 540m

SO he is 270 m from hill - not 297m....

anonymous · Answer

Oh, pardon me, it was 330 ms-1 
In this case, u're absolutely correct too :) thanks !