Question 666197
λ = 4/60 cars per second so the cdf of the exponential is  1-e^-λ*t

So P[t<=11] = 1 - e^(-11*(4/60)) =  1-e^(-0.733333).  

Then P[t>11] = 1-P[t<=11] = 1 - (1-e^-0.73333) =  e^-0.73333 = .4803