Appointment booking using Maps api and real time tracking of location

I need an Android app. I would like it designed and built. Appointment booking responsive design. or a web site and a mobile app. user 1 - book appointment online. this appointment is for home service. so if someone book a 7am slot in a particular pin code and when an another appointment is to be booked in a different pin code, via Google map system should identify the time taken to travel from one place to another and should recommend appropriate time. user 2- sales guy uses these appointment viewed on his mobile phone. he will see all appointment seen on google map view And he need to check in when he reaches the appointment spot. his location at all time to be tracked in realtime and shared with admin. entire sales guy travel should be tracked and can be viewed as map.