Export 30 fps and 60 fps clips in the same video

Hi all, i'm new on HitFilm 4 Express. I made some videos with my Sjcam both 60 fps and 30 fps (video lapse). 
When i export the entire video at 60 fps, the result is that the images of the video are faster than the originals but the audio is the same.
Sjcam tells me that the video-lapse is set to 60 fps but HitFilm at 30 fps, why?
The 2nd fact is that when i saw the entire video on the timeline, audio and video match together.
How could i do to export clips with different fps in the same video? 

Thanks in advance, sorry for my english, it is not my mother language.

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