Two lighthouses can be seen from the top of a hill the first flashes once every 8 seconds and other glashes once every 15 seconds if they flash at the same time how long it will be until they flash at the same time again
Answers
Answer:Find the Least Common multiple of 8 and 15
Prime factor 8: 2,2,2
Prime factor 15: 3*5
LCM: 2*2*2*3*5 = 120 seconds, 2 minutes.
:
they will flash together at 12:02 AM
Step-by-step explanation:
Answer:
Concept:
The smallest number equally divisible by the two integers is known as the Least Common Multiple (LCM) of two numbers. It is often referred to as LCD or the Least Common Divisor.
Step-by-step explanation:
Given:
Two lighthouses can be seen from the top of a hill.
The first flashes once every 8 seconds and
Other the lashes once every 15 seconds.
Find:
If they flash at the same time how long it will be until they flash at the same time again
Solution:
To find the time we need to take LCM of both the given numbers as shown in the image
The LCM of 8 and 15 is 120. That is 120 seconds.
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