Question

Two ships flash their lights every 20 minutes and 30 minutes respectively in the ocean. If
the ships flashed their lights together at
7.m. when will they flash the lights together next?
​

Answer 1

Answer:

assuming that the ships flashed their lights at 7 a.m together,

L.C.M(20, 30) = 60

So, they will flash their lights together 60 minutes later.

That is, at 8 a.m.