It typically take longer for a heavier object to slow down therefor, a train will take more time. <span />
The speed of sound at T=25°C is Vs=346 m/s. So the sound has to reach the cliff and return back to you so the path it needs to travel is s=2*440 m = 880 m.
Since the speed of sound is constant s=Vs*t, and t= s/Vs=880/346=2.54335 s. You will hear the echo after t=2.54335 s after you shouted.
It takes approximately 8 minutes and 20 seconds.
Answer:
1-d
2- a
3-e
4-b
5-c
This is the correct sequence
