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adoni [48]
3 years ago
13

Two lighthouse

Mathematics
2 answers:
larisa [96]3 years ago
8 0

Answer:

30 seconds

Step-by-step explanation:

suppose they flash together the first time at time t1

they will flash together again on the first multiple of t1 that is common to the two lighthouses which is 30

15*2=30

6*5 = 30

BlackZzzverrR [31]3 years ago
4 0

Answer:

30 seconds.

Step-by-step explanation:

This will be equal to the lowest common multiple of 6 and 15.

6 = 2 * 3

15 = 3 * 5

The LCM = 2*3*5 = 30.

Answer : 30 seconds.

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