iOS apps for teaching elapsed time?

[calebsmama03]

DD knows how to read a clock and tell time find but is struggling with how to tell elapsed time (ie: how much time is there from 4:30 to 6:15?). We've tried several ways of teaching her and she isn't getting it so I'm looking for a fun game or app that works on this concept. Any recs? TIA!

[BunnyBee]

Not an app, but one of the bright yellow clocks with movable hands from the teacher store was what cemented the concept for my DS. Set it at the first time and move the hands to "see" and count time elapse. Khan Academy has word problems you can use to work with the clock.

[calebsmama03]

Does the hour hand move automatically with this one as you more the minutes? We have some clocks but the child has to move both hands and she still cannot get the concept unless one of using there doing it for her. :/