Four tubelights begin to light together and light at intervals of 5 8 9 and 11 seconds respectively ...........

Logical Reasoning(Master ) Arithmetical Reasoning

Four tubelights begin to light together and light at intervals of 5, 8, 9 and 11 seconds respectively. How many times will they light together in two hours including the one at the start?

2 times

4 times

1 time

5 times

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Explanation:

L.C.M. of 5, 8, 9 & 11 is 3960.
So, the tubelights will light together after every 3960 seconds i.e. 1 hour 6 minutes.
Therefore, in two-hours (or 120 minutes), the tubelights will light together 2 times, including the one at the start.