it takes john 30minutes to walk 15 blocks to the library as this rate how many blocks can he walk in one minutes

When y’all answer can y’all explain too !

Im literally having a mental breakdown

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?