Question 704184
You just need to know what each individual unit conversion is.

1 inch = 2.54 cm.
60 sec = 1 min.
60 min = 1 hour.


You begin with 40 cm^3 per second, and you want how many inch^3 per hour.
{{{40 (cm^3/s)*(1 in/cm)*(1 in/cm)*(1 in/cm)*(3600 s/hour)}}}=?
(The typesetting is not perfect; there is supposed to be a space between the "1" and the "in/cm"...)