Formcalc time calculation

i'm trying design in adobe livecycle cs2, has table 5 rows,with column "start time" "end time" "hours work" , footer row column "total time". need each row hours work answer (end time - start time) no problem, cant hours worked add give me total time answer! can someboddy please me

i not experienced in scripting,

i have table "start time", finish time" , "working time" columns.

for each row working time calculated separately , here formcalc total time

 

var t_t = 0

if (table1.row[*].working_time > 0) then

t_t = (sum(table1.row[*].working_time))

total_time = concat(t_t, " h")

else

total_time = ""

endif

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