Assuming its the same temp, use this equation for pounds and minutes then solve:

cross multiply
50(3.5) = 175 minutes
it'll take an 2 hours 55 minutes
7x+12+6x-2=-4
7x-6x=-4-12+2
13x=-14
x=-14 divide 13
x=-14 over 13 put 14 over 13 in a fraction
Answer:
8x - 4x
Step-by-step explanation:
hopefully this is what your asking for