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Secondary 1 | Maths
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Nicholas
Nicholas

Secondary 1 chevron_right Maths chevron_right Singapore

Help with question 1

Date Posted: 4 months ago
Views: 34
Amos Quek
Amos Quek
4 months ago
Try using HCF or LCM to find how long till they flash together then add the time to the given time. I am also a sec 1

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Emma Everitt
Emma Everitt's answer
27 answers (Tutor Details)
1st
The next time they flash together is basically the lowest common multiple of 20, 25 and 65. Once you have that, convert to mins and seconds and add to the first time they flashed together.