A man is riding a vehicle towards a vertical cliff with a

Last updated: 6/24/2023

A man is riding a vehicle towards a vertical cliff with a velocity of 36 km h He fires a gunshot and hears its echo after 4 sec The speed of sound in air is 320 m s i ii The distance between the cliff and the position where he shot the gun is A 640 m B 680 m C 620 m D 660 m If the speed of the vehicle increases by 4 times then the time taken to hear the echo is A 11 3 seconds B 10 3 seconds C 3 seconds D None of the above 4