A man drivers a car and covers a distance of 120 km in 2 hours . How far will he travel in 2hours if the speed is reduced by 15km/h

How come you ask some quite complicated questions in one post

and then a trivially easy one like this?

at 120 km for 2 hours, the speed would be 60 km/h
so the distance covered in 2 hours for the new speed of 45 km/h
would of course be 90 km