Verified Answer :

Since3122015

\(\frac{120}{8}\\15\)

15 seconds-per-banner

apologiabiology

so 8 banneers per 120 seconds
8 is to 120=8/120 or 120/8
120/8
make bottom number 1
divide
120/8=60/4=30/2=15/1=15

15 seconds is the answer

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