Sandra rode her bike 5 times as many miles as Barbara. If b, the distance Barbara rode, equals 3.4 miles, what is the correct expression and distance Sandra rode? b + 5; when b = 3.4 the distance Sandra rode is 17 miles. 5b; when b = 3.4 the distance Sandra rode is 17 miles. 5b; when b = 3.4 the distance Sandra rode is 8.4 miles. b + 5; when b = 3.4 the distance Sandra rode is 8.4 miles.