Humans have been on the Moon, so why haven’t humans visited any other planets in the solar system?

Venus. First impact on the surface of another planet. ... First successful soft landing on another planet; transmitted from surface for 23 minutes, The spacecraft definitively confirmed that humans cannot survive on the surface of Venus, and excluded the possibility that there is any liquid water on Venus.

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

what is the actual question though?