Question

Abdi has two electric train sets: A and B. Each train is on its own circular track. He starts both trains at the same time. Train A returns to its starting point every 12 seconds. Train B returns to its starting point every 9 seconds. If the trains continue traveling, what is the least amount of time, in seconds, that both trains will arrive at the starting points at the same time?

Answer 1

Answer:

Step-by-step explanation:

12= 2×2×3

   =2²×3

9=3×3

 =3²

LCM=2²×3²

       =36 seconds

∴both trains will arrive at the starting points after 36 seconds

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