AMC 8 2018 Problem 6

On a trip to the beach, Anh traveled 50 miles on the highway and 10 miles on a coastal access road. He drove three times as fast on the highway as on the coastal road. If Anh spent 30 minutes driving on the coastal road, how many minutes did his entire trip take? $\textbf{(A) }50 \textbf{(B) }70 \textbf{(C) }80 \textbf{(D) }90 \textbf{(E) }100$