Giving brainlist to whoever answers

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?

Agroup of three friends order a combo meal which includes two slices of pizza and a drink each drink is priced at $2.50 the combined total of $31.50 how much is the cost of a slice of pizza