Respuesta :

1 second =   1 minute     =    1 hour      =     1 hour
                   60 seconds     60 minutes     3600 seconds
so
23,000 seconds * 1 = 1150 minutes * 1  = 115 hours or 19.16667 hours
                             60         3               60      6
the one that converts from seconds to minutes then fro mminutes to hours
aka

multiply by 1min/60sec then multiply by 1hr/60min

this leaves you with bout 6.38888 hours

C is the answer