The word "and" separates the whole number from the decimal portion.
Writing "seventeen thousand" means that 1 goes in the ten-thousands place, 7 goes in the thousands place, and the rest is filled in with zeros: 17,000.
"One hundred six thousandths" means that the 6 goes in the thousandths place; the 0 goes in the hundredths place; and 1 goes in the tenths place: 0.106
The descent of the balloon would take 14 minutes To find the answer to this problem, take the elevation change (315) and then divide it by the rate of descent (22.5)