Aplane ride lasted 6.4 hours. how many seconds did the plane ride last

1 * 60 * 60 = 3600 (seconds in 1 hour)

3600 * 6 = 21600 (seconds in 6 hours)

3600 * 0.4 = 1440 (seconds in 0.4 hour)

21600 + 1440 = 23040 (6 hours + 0.4 hours)

your answer is 23040

i think that you should ask google for the answer to that problem because if we don't know it google does

relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

it alot will look like this 4.4