Cumulative time calculation in Excel 2003

Hi all

I'm having trouble making my worksheet calculate minutes elapsed.

Presently I have this in A and B , where A is adding cumulatively the
times showing in B :

A B

Mins/Secs Mins/Secs

Total

0.00 2.00
2.00 2.30
4.30 3.00
7.30 3.30
10.60 4.00
14.60 4.30
18.90 5.00
23.90 5.30

Clearly , column A should be round to minutes and seconds and not base
10.

The chart should read like this :

A B

Mins/Secs Mins/Secs

Total

0.00 2.00
2.00 2.30
4.30 3.00
7.30 3.30
11.00 4.00
15.00 4.30
19.30 5.00
24.30 5.30

In column A presently I'm using

¤+B4

in the first calculation cell and dragging down to make the calculation.

Can someone suggest an alternative formula to have it work out
accumulated minutes and seconds correctly , please?

thanks.