Need answer and how to solve

Question

Boy jogged 4/5 km, girl jogged 1/2 km more than boy, what the distance boy jogged?

Answer 1

NOTE: Boy jogged 4/5 km.

Girl jogged:

(distance boy jogged) + 1/2 km = 4/5 km + 1/2 km = 8/10 km + 5/10 km = 13/10 km = 1 3/10 km

{note: There is no reason - and it is poor practice -- to change from fractions to decimals.)

Answer 2

The distance the boy jogged is explicitly stated: 4/5 km

Now if you meant the distance the girl jogged: 4/5 + 1/2 = 8/10 + 5/10 = 13/10 = 1.3 km