WILL GET BRAINLIEST AND LOTS OF POINTS IF YOU ANSWER CORRECTLY W EVIDENCE (QUESTION IN PIC BELOW)

Plz me get these answer dubble cheak ur answer plz ppl i need it right

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.