your formula cell is formatted as date/time, change it to number format should work
Excel 2013/2016
G H I 1 00:53:31 94.19 1.76
<colgroup><col style="width: 25pxpx"><col><col><col></colgroup><thead>
</thead><tbody>
</tbody>Sheet1
Worksheet Formulas
Cell Formula I1 =H1/(G1*24*60)
<thead>
</thead><tbody>
</tbody>
<tbody>
</tbody>