Question

two guns are fired after interval of 5 mins but a person coming in the direction from where guns were fired hears the sound at a interval of 4.5 mins. If the velocity of sound was 220 feet/sec,then find the speed of that man.

Answer 1

In 30 sec sound covers the same distance as train in 5 min.

In 30 seconds sound covers 150*30=4500=4.5 km, --> hence in 5 minutes train covers 4.5 km --> in 1 hr train covers 4.5*6 km= 27 km.