google spreadsheet - How to convert datetime interval to hours? -

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i have spreadsheet:

              b        c       d          e 1  08/13/2013   02:10    4                   2  08/13/2013   02:19    10      00:09:00   160

in d2, have formula : =if(b2="";"";to_date(concatenate(a2;" ";b2))-to_date(concatenate(a1;" ";b1)))

in e2 have formula : =if(d2="";"";(c2-c1)/d2)

but e2 outputs wrong result, 160. want 40 (=10-4/0.15). 0.15 value in d2 converted hours.

how can that?

do not quite understand you're trying calculate, information explains, following formula can help:

=if(d2 = "", "", round((c2-c1)/(d2*24), 0))

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