1 ô tô đi từ A đến B, 1/3 quãng đường AB xe chạy với vận tốc 60km/h, 3/4 thời gian còn lại xe chạy với vận tốc 50km/, cuối cùng xe chạy với vận tốc 40km/h. Tính vận tốc trung bình

the answer would be 32*f

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles