Calculate vehicle trip

I want to calculate the vehicle trip but facing problem. No Groupby is working .

Current Result

ZoneId  Objectid Number commants StartTrip TimeFirst          Inside 
 540    3414    VT-0678T VOLVO   Oil Fd  2016-03-17 17:10:31    1   
 540    3414    VT-0678T VOLVO   Oil Fd  2016-03-18 14:15:19    0   
 543    3414    VT-0678T VOLVO   Khour   2016-03-19 09:38:30    1   
 543    3414    VT-0678T VOLVO   Khour   2016-03-19 11:55:04    0   
 540    3414    VT-0678T VOLVO   Oil Fd  2016-03-21 07:32:58    1   
 540    3414    VT-0678T VOLVO   Oil Fd  2016-03-21 13:34:25    0
 543    3414    VT-0678T VOLVO   Khour   2016-03-22 07:29:56    1
 543    3414    VT-0678T VOLVO   Khour   2016-03-22 10:09:58    0
 540    3414    VT-0678T VOLVO   Oil Fd  2016-03-22 15:22:41    1
 540    3414    VT-0678T VOLVO   Oil Fd  2016-03-22 16:45:02    0   
 543    3414    VT-0678T VOLVO   Khour   2016-03-24 07:41:27    1   

ObjId Number    StartTrip  EndTrip    TimeFirst            TimeLast 
3414  VT-0678T  Oil Fd     Khour    2016-03-18 14:15:19   2016-03-21 07:32:58
3414  VT-0678T  Oil Fd     Khour    2016-03-21 13:34:25   2016-03-22 15:22:41
3414  VT-0678T  Oil Fd     Khour    2016-03-22 16:45:02   cont

select z.ZoneId, o.ObjectId,o.Number,o.Comment,z.Name StartTrip,zs.TimeFirst,zs.Inside,z.ZoneGroupId

from dbo.Object o join 
dbo.GroupObject gobj on o.ObjectId = gobj.ObjectId join 
dbo.[Group] g on gobj.GroupId=g.GroupId join 
dbo.[ZoneState] zs on o.ObjectId=zs.ObjectId join 
dbo.[Zone] z on zs.ZoneId=z.ZoneId
where (z.ZoneGroupId=1096 OR z.ZoneGroupId=1095) and o.ObjectId=3414 and (convert(date,zs.TimeFirst)>='2016/2/15') and (convert(date,zs.TimeFirst)<='2016/3/24')  
ORDER BY o.Number