Warrior Warrior
  • 26-08-2023
  • Mathematics
High School

One lighthouse flashes every 10 seconds, and a second lighthouse flashes every 8 seconds. If they flash at the same time, how long will it take for them to flash at the same time again?

Answer :

texaschic101 texaschic101
  • 15-07-2023
for this, we need to find the lowest common multiple of 10 and 8

multiples of 10 : 10,20,30,40,50
multiples of 8 : 8,16,24,32,40

so the LCM of 10 and 8 is 40

therefore, they will both flash at the same time again in 40 seconds.
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