Question

Sound travels faster in iron than in air . So, sound from both media reach the other boy in different durations
of time. Why?

Answer 1

the speed of the sound in solids is Greater then Anymatter therefore the speed of sound in an iron than in air is Greater

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Answer 2

You know that sound needs medium to travel.

And you also know how its travel in a medium.

By colliding particles.

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Now in air(gaseous medium), particles are far to each other.
But in solid, particles are very close to each other.

As particles are very close to each other, they can collide fastly and thus sound travel fast in solid.