Newborn twins fall asleep at 8:00 P.M. The first twin wakes up every 60 minutes, then goes back to sleep. The second twin wakes up every 80 minutes. How long after 8:00 P.M. do both twins wake up at the same time?

Relax

Respuesta :

the will both wake up at the same time after 240 minutes, or 4 hours