Question

Two lighthouses flash their lights every 30 seconds and 40 seconds respectively. Given that they flashed together at 6 pm, when will they next flash together?

Answer 1

Answer:

At 6:02 pm

Step-by-step explanation:

The lcm of 30 & 40 is 2×5×2×3×2= 120

So the last they flashed together at 6 pm next they will flash together after 120 secs i.e. after 2 minutes.

So, next they will flash together at 6:02pm.

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