Carry over minutes only

Hi everybody. I am new to this forum and I have a question.

I am using Microsoft Excel 2003. My question is about calculating time.

1 hour + 1 hour and fifteen minutes would equal two hours and fifteen minutes. Using Microsoft Excel 2003, let's say I am using cells A1, A2, A3 and A4.

A1 will be 1:00 for 1 hour
A2 will be 1:15 for 1 hour and fifteen minutes
A3 will be my total for adding cells A1 and A2 and the answer will be 2:15 for two hours and fifteen minutes.

My specific questions is: Would it be possible for me to have the fifteen minutes (0:15) from the two hours and fifteen minutes (2:15) automatically carry over to cell A4 or cell A4 of another worksheet without having to type in 0:15 or having 2:15 appearing in cell A4?

I hope I have clearly explained what I am asking, if anyone knows please respond and give clear instructions. Thank-you

You can use, =MINUTE(A3) to get the number 15... or the minute portion in whole numbers..

or

=TIME(0,MINUTE(A3),0) to get the minute portion in Excel time value... 0:15

Or =MOD(A3, 1/24)