Question

Three different lights shine after every 10 seconds, 15 seconds and 25 seconds respectively. If all these lights change simultaneously at 6:25:00 hours , then the time when they will again shine simultaneously is?

Answer 1

Answer:

6:27:30 hour

Step-by-step explanation:

lcm:::::

150second=2min.30sec.

Answer 2

At  6 :27 : 30 hrs lights will again shine simultaneously if they shine after evry 10 , 15 & 25 secs respectively & they shined together at 6:25:00 hrs

Step-by-step explanation:

Three different lights shine after every 10 seconds, 15 seconds and 25 seconds respectively

To find the time gap to shine together agin

we need to find LCM of their time

10 = 2 * 5

15 = 3 * 5

25 = 5 * 5

LCM = 2 * 3 * 5 * 5  = 150 Sec  

= 2 Mins 30 Secs

all these lights shine simultaneously at 6:25:00 hours

time when they will again shine simultaneously is 6:25:00  + 2 : 30

= 6 :27 : 30 hrs

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