Question

a man is driving a car at a speed of 72kmph towards a hill. He sounds the horn and hears it's echo after 2 seconds. The distance between the hill and the place where the horn was sounded is (v= 340m/s)​

Answer 1

Answer:

v=72kmph

v=72*5/18=20m/s

let's car travel X distance in 2s

x= v*t

x= 20*2=40m

total distance travelling by sounds= d(d-x)

vsound*t= 2d-40

340*2=2d-40

2d=680+40

2d=720

d=260m