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(117/t +12)(t-1/5)=117
117-117/5t +12t-12/5=117
-117/5t+12t-12/5=0 /*5t
-117+60t²-12t=0 /;3
20t²-4t-39=0
Δ=16+3120=3136 √Δ=56
t1=[4-56]/40=-52/40=-1,3 = sprzeczne bo to chyba czas
t=[4+56]/40=60/40=1,5
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v=117/1,5=78