Default [Q] 32GB Samsung Class 10 Micro SD slow?

I have a Samsung Galaxy S4 (SGH-M919), and I recently purchased a Samsung Evo 32GB Class 10 UHS-1 Micro SD card. When I run the A1 SD Bench app, it shows Read speeds of 16MB/s and Write speeds of 11MB/s. It seems to be a bit slow seeing as the advertised read speeds were up to 48MB/s!
Should I return this card for another one?

Thanks

(Sorry if this is a dumb question. Super Noob here lol)