178 views

The traffic lights at  three different road crossing change after 24 sec , 56sec , 36sec  respectively If they all change simultaneously at 10:00 AM. At what time will they again change simultaneously

1. 10:16:54 AM
2. 10:18:00 AM
3. 10:17:02 AM
4. 10:22:12 AM

edited | 178 views

+1 vote
just find out LCM(36,54,24)

=216

now verify answer with n(216) for n>=1.
by Junior (765 points)
edited
0

Another approach could be :-
Find HCF .
(Given Option) mod HCF should be 0   :)

0
lCM(36,56,24) = 504

I think all options are wrong
0
he posted question wrong.

instead of 56 there is 54.

option b is ryt
0
Yes, B is correct if it is $54$
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Yes it is 54. I made a mistake while posting question. B is correct. I too got B