Car Illustrated Parts

Please help with this physics problem! Thanks!?
In a circuit in the bank, the smallest circular path on which cars can move has a radius of 111 m, while the largest has a radius of 157 m, the drawing illustrates. The external wall height is 15.7 m. Find (a) and small and (b) the highest speed at which cars can get to this issue without resorting to friction. I found the answer to Part (a) to 371.38, but that's not right. Please help as much as you can! Thanks, thanks, thanks!
Where T is the inclination of the track to the horizontal, v is the speed of the car, the track radius r, g acceleration of gravity. t = arcsin (15.7 / [157 111]) = 19.95 degrees. When the car without using the friction circle tan (t) = v – ^ 2 / (rg) v = sqrt [as rg (t)] sqrt [111 * 9.81tan (19.95)] <V <= sqrt [157 * 9.81 tan (19.95)] 19.9 <m / s <v = = 23.6 m / s.
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