Literal equations i=pry solve for p

I=pry

I/ry=p

Interest divided by rate times years is equal to the principle.

The answer would be:
120 / t – 36 = 120/t = 1/6*10 mi/hr = 1 hr/60 min = 1/6
120 (bt) = 720 (t – 3b) + t (t-36)720t = 720t – 25920 + t^2 – 3bt0 = t^2 – 36t – 25920Get the factor. So it would be:(t – 180) (t + 144)t = 180 minutes or 3 hours.So 120/3 = 40 mph in daytime.