SOLUTION: To lap a running track, Tom takes 65 seconds, Dick takes 70 seconds and Harry takes 75 seconds. If they start together, when will they next be together at the starting point?

Question 323915: To lap a running track, Tom takes 65 seconds, Dick takes 70 seconds and Harry takes 75 seconds. If they start together, when will they next be together at the starting point?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
In such problems you have to take the LCM of the numbers. That is when they are together
Factors of 60= 2*2*3*5
Factors of 70 are 2* 5*7
Factors of 75 are 3*5*5
The LCM will be 2100
After 2100 seconds they will be together after 2100 seconds
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