#Time of your with two digit in minutes like 5 to 50
time_val="13.50"
#split by "."
split_val=time_val.split('.')
#get a hours
hour_val=split_val[0]
#get a minutes
min_val= (100*60)/split_val[1].to_i
if(min_val == 60)
   hour_val +=1
   min_val=0
end
#it's concat a hours and minutes then it's final result
final_time= hour_val.to_s + ":" + min_val + ":00"

sec = (13.5 * 3600).to_i
min, sec = sec.divmod(60)
hour, min = min.divmod(60)
"%02d:%02d:%02d" % [hour, min, sec] # => "13:30:00"