Development of location-based applications.

the Task is simple.

There are 2 smartphone – startton "A" and phone "B"
You need to create an app for these smartphones to maps (Yahoo, Google, etc.) reflected the location of these smartphones. I.e. when the smartphone user "A" enters the application, he got a button "Find phone "B", similar to the smartphone "B".

2 requests:
- immediately designate a value (approximate value) of the execution of this work;
- immediately ask questions if something is unclear.

The design is absolutely not important what will be.