A clock shop has three cuckoo clocks on display. The cuckoos appear at different time intervals. One comes out every 20 minutes, one comes out every 25 minutes, and one comes out every 60 minutes. If...

A clock shop has three cuckoo clocks on display. The cuckoos appear at different time intervals. One comes out every 20 minutes, one comes out every 25 minutes, and one comes out every 60 minutes. If they all appear at 5 o'clock, what is the next time they will all come out together?