Question

15. Three bells ring at intervals of 16, 18 and 20 seconds respectively. If they all ring at
11 a.m. together, at what time will they ring next together?​

Answer 1

Step-by-step explanation:

Three bells 7,10,14 minutes

They will be ringing after L.C.M of (7,10,14) minutes

Factorise 7,10,14

7=7

10=5×2

14=7×2

⇒ L.C.M (7,10,14)=7×2×5=70

∴ They will be ringing together after 70 minutes.