Question

Three traffic lights at three different road crossings change after every 48 seconds , 72 seconds and 108 seconds respectively . If they all change simultaneously at 8 hours , then at what time they again change simultaneously ?

Answer 1

Answer:

hey mate

here is your answer

The traffic lights at three different road crossings change after every 48 seconds, 72 seconds and 108 seconds respectively. If they change simultaneously at 7 a.m. at what time will they change simultaneously again? L.C.M of 48, 72, 108 = 2 x 2 x 2 x 2 x 3 x 3 x 3 = 432 sec.

Answer 2

Answer:

48=12×4

72=12×6

108=12×9

L.C.M (48 , 72 , 108) =12×4×6×9

=2592 SECONDS

AFTER 2592 SECONDS  ALL THREE LIGHTS WILL BLOW

2592 SECOND =43.2 MINUTE

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