ICSE Class 6 Answered
The traffic light at 3 diffrent road crossing change after every 48 sec. 72sec.and 100sec.respectively. if they change simultaneously at 8 am,at what time will they change again simultaneously.
Asked by manjarirawat373 | 19 Feb, 2019, 04:56: PM
Expert Answer
Prime factorisation of 48, 72 and 100.
48 = 2 × 2 × 2 × 2 × 3
72 = 2 × 2 × 2 × 3 × 3
100 = 2 × 2 × 5 × 5
LCM(48, 72, 100) = 3600
3600 seconds = 60 mins = 1 hour
Therefore at 8 + 1 = 9am they change again simultaneously.
Answered by Yasmeen Khan | 20 Feb, 2019, 12:35: PM
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