A and B start from 120 kilometers at the same time, B is in front. The speed of a and B is 60 km and 40 km. How long can a catch up with B after departure A and B start at the same time from two places 120 kilometers apart, and B is in front of A. the speed of a and B is 60 km / h and 40 km / h respectively. How long can a catch up with B after departure?

A and B start from 120 kilometers at the same time, B is in front. The speed of a and B is 60 km and 40 km. How long can a catch up with B after departure A and B start at the same time from two places 120 kilometers apart, and B is in front of A. the speed of a and B is 60 km / h and 40 km / h respectively. How long can a catch up with B after departure?

Let car a catch up with car B in X hours
(60-40)X=120
20X=120
X=6
Six hours after departure, car a overtakes car B