Daria walked 1 2/5 miles this morning and 2 3/5 miles in the afternoon. How many miles did Daria walk in all?

For starters, don't shout "BRO I NEED HELP". 

 

Anyways, the answer is \(\color {brown} \boxed{4}\), because the 2/5 and 3/5 sum to 1.