Can someone please help me find the equation and answer to the last question below? It's in bold below. I gave other information from the problem to help. Thank you!!

The ride will last for a total of 0 < t < 120 seconds

The velocity of the coaster is described by v(t) = t - 5t + 3t 7

In order to place the loop in the correct spot, what the is coasters acceleration after 20 seconds?

v(t) = t - 5t + 3t 7

a(t) = v(t)

v (t) = 3t-10t+3

v (20) = 3t-10t+3

v(20) = 1003 feet/sec/sec

In order to structure the loop in the correct spot how far has the roller coaster traveled after 50 seconds?

I need the equation for how to find how far this roller coaster has traveled after :50s.