There are indeed ('obviously' as you say) some time, speed and distance questions in the exams. Hardly any of them require more than just basic cross-multiplication. Since this is really basic stuff, I doubt there will be many text books or internet sites with practice questions specific to aviation.
If you want to get an impression of what it is you will have to learn and deal with, this site is worth a look:
http://www.captonline.com/ATPLA.html
The subjects listed under 'Mock Exams' that require some basic maths are Flight Planning & Monitoring, Mass & Balance, Navigation, Performance, and Principles of Flight.