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This can be due to a fault with one of the rear wheel bearing/hub assemblies starting to fail.The internal bearings can cause odd noises like this here at certain speeds as I have seen several times before and had to replace the bearing/hub assembly for this issue here.I have even heard some that sounded like a helicopter was trying to land on the vehicle just to show you how odd these can sound.
If the rear wheel bearings were not checked for play or wear this needs done.If a fault is found with one or more of them they will need replaced and can be common.This usually requires a hoist to lift the vehicle onto to check for bearing play and an automotive stethoscope to listen for the noise.
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