选择题
2018 AMC 8 Problem 6: Beach Trip Time
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?
2018 AMC 8 第 6 题：海滩旅行时间
在一次去海滩的旅途中，Anh 在高速公路上行驶了 50 英里，在沿海公路上行驶了 10 英里。他在高速公路上开车的速度是在沿海公路上的三倍。如果 Anh 在沿海公路上开车 30 分钟，他整个行程需要多少分钟
A.
50
B.
70
C.
80
D.
90
E.
100