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Yes it is safe, as long as you do not exceed the dosage for each
Of course you need to make sure that if the persists, then a pediatric consultation is taken to find the cause of the fever, and appropriate tests / medications used as needed
But, using both together in appropriate doses is generally considered safe,
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his weight is 120 lbs. the tablets are:
motrin 200mg per tablet
tylenol 325 mg per tablet
If my calucaltions are correct he received
4am tylenol 650 mg
8am motrin 400 mg
6pm tylenol 650 mg
midnight tonight 400 mg
it appears that according to your calculations these doses were safe?