2 internet connections

i have 2 internet connections
can i use both of them to download same time ?
1 480 kb and other 240 so speed be 720 ?

or make 1 download some links and other download other links same time ?

or make 1 for download and other i use it for playing online it will be low ping and other downloading high ping ?

all same pc

is this available ?

pls answer

sry for bad eng

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