Four traffic signals glow at intervals of 5, 10, 15 and 20 minutes. When will they glow together?

Three bells rang together at 8.30 a.m. If they rang at intervals of 4, 5 and 6 minutes respectively, when will they ring together again?

Three bells ring at intervals of 30, 45 and 60 minutes respectively. If they begin ringing together at 5 p.m., then they will ring together again at___

Three bells ring at intervals of 15,20 and 30 minutes.If they all ring at 10 'clock in thmorning together,at what time will they ring together again?

In a shop. There are three clocks which chime at intervals of 15,20 and 30 minutes respectively. They all chimetogether at 10 a.m. At what time will they all chime together again ?

Three bells toll together at intervals of 9, 12, 15 minutes . If they start tolling together, after what time will they next toll together ?

Three bells toll at intervals of 9, 12, 15 minutes. If they start tolling together , after what time will they next toll together ?