At the same time nah... but 1v1. Could go either way
yes he can beat both of them at the same time...minato is actually no threat to nagato because all he has is speed and kcm naruto already almost equaled minato in speed and nagato showed kcm naruto and killer bee how much speed dnt matter...
minato will do what throw a kunai at nagato he will blow it away thus rendering the ftg useless, then minato will figure out the 5 second interval on shinra tensei and try to come up with a plan so the next time he throws it he will have an opportunity to get ti thew but what will he do??? rasenagan? nope it gets absorb by the preta shield...or maybe he gets grabbed by the throat like killer bee did, this is if minato can even get passed the summons, a dog which he doesnt have the power to defeat, a chameleon that he cannot see...
ct win against minato easily and itachi both at the same time...it took a tbb+rasenshuriken+magatama to destroy ct...minato and itachi has magatama+big rasengan, its arguable if their combined techs can even compare to killer bee's tbb so how can they win???