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Answer:
1.Sound travels about 17 percent faster in air at 37°C than in air at 0°C.
2.iron, because out of air, water,iron and coal, iron is a solid, therefore, sound travels fastest in iron.
3.Sound travels more slowly than light, and it does not always travel at the same speed. Two main factors affect the speed of sound: the material that makes up the medium—such as air or water—and the temperature. If we know the medium and the temperature, however, we can predict the speed of sound.