In April, Phillipa rode
13
.
5
+
8
.
7
+
11
.
1
miles on her bicycle. In March, she rode
(
13
.
5
+
8
.
7
+
11
.
1
)
÷
2
miles, and in May, she rode
4
×
(
13
.
5
+
8
.
7
+
11
.
1
)
miles.
Determine the month when she rode the most and the month when she rode the least. How many times farther did she ride in the month when she rode the most than in the month when she rode the least?
