

please correct your question.
As per my understanding of the question,
Aman travels by auto = 1 km
by bus = 3 km
walks 650 m
1st we have to make all units same
1 km = 1000 m
1 m = 1/1000 km
650 m = 650/1000 km = 0.65 km
now add all the distance travelled by aman = 1 km + 3 km + 0.65 km
= 4.65 km
