okssa - it should be clear how to get the number of hours there are in the 243 minutes. Just use the fact that there are sixty minutes in an hour and do the division and perhaps use floor.
b = mod(a,m) returns the remainder after division of a by m, where a is the dividend and m is the divisor. This function is often called the modulo operation and is computed using b = a - m.*floor(a./m). The mod function follows the convention that mod(a,0) returns a.
You can use this to determine the remaining number of minutes. Without giving away the answer, what would be a and what would be m?
