UPSC CDS 2 2018 Math Paper

A right clock gains 60 minutes space over hour–hand in

720

11

minutes.
Here minute–hand overtakes the hour–hand in 72 minutes.
Thus, the time lost by minute–hand in 72 minutes =72−

720

11

=

72

11

minute
Time lost in 24 hours =

1

11

×24×60=130

10

11

minute