Question

three colour lamps glow at intervals of 10,12,and 15 second.After what time all three bulbs will glow together. ​

Answer 1

Answer:

60 sec

Step-by-step explanation:

first lamp glow at the interval of 10 sec,

second lamp glow at the interval 0f 12 sec .

third lamp glow at the interval of 15 sec.

LCM ( 10 , 12 , 15 ) = 60.

so all three lamps will glow after 60 sec together.

Answer 2

Answer:

60 sec

Step-by-step explanation:

first lamp glow at the interval of 10 sec,

second lamp glow at the interval 0f 12 sec .

third lamp glow at the interval of 15 sec.

LCM ( 10 , 12 , 15 ) = 60.

so all three lamps will glow after 60 sec together.