Sameer walks a certain distance and rides back, taking a total time of 40 minutes. He could walk both ways in 60 minutes. How long would it take him to ride both ways?

Riding both ways takes 20 minutes.

Walking one way plus riding one way = 40 min.

Walking both ways = 60 min, so walking one way = 30 min.

Riding one way = 40 - 30 = 10 min.

Riding both ways = 2 x 10 = 20 min.