a wooden log is to be carried by 2people if one of them is strong and another weak how will they carry the log?show with diagram and also give reason​

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

conservation of mass

mass before something happens = mass afterwards