450/340=1.3
1.3 sec is the answer because you take the distance and divid by the rate
For bleaching a stain, there will be an identifiable odor and it will easily absorb colors and/or stains. Burning a match also has odor involved, but the smoke that is released is from a hot fire that is chemically produced by the formula to make the tip of the match.
The element with 4 protons in the nucleus in Beryllium.