The traffic lights at three different road crossing change after every 48 secs, 72 secs and 108 secs respectively. If they change simulatenously at 7 a. m. at what time will they change simulatenouslyagain

Question

Mathematics

Iris Washington

24 March, 09:14

The traffic lights at three different road crossing change after every 48 secs, 72 secs and 108 secs respectively. If they change simulatenously at 7 a. m. at what time will they change simulatenouslyagain

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Answers (1)

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Aldo Jacobson · Answer 1

48 = 2 * 2 * 2 * 2 * 3

72 = 2 * 2 * 2 * 3 * 3

108 = 2 * 2 * 3 * 3 * 3

LCM (48; 72; 108) = 432

432 secs = 7,2 min. = 7 min. 12 secs

7 a. m. + 7 min. 12 secs = 7:07:12 a. m. - answer.