Question

At two different wad crossing
the traffic lights change every
60 seconds and 120 seconds,
sospectively. If they change
together at 8:30 am
When will they change at
the same
time once again

answer fast
I will make u brain list​

Answer 1

Answer:

answer is after 120 secs or at 8:32 am

Step-by-step explanation:

Just take LCM of both and the answer will come

Answer 2

8:32 am

step -by-step explanation:

The traffic light at three different road crossing change after every 60 seconds, 120 seconds seconds respectively.

•So let us take the LCM of the given time that is 60 seconds, 120 seconds,

⇒ 60 = 2 × 2 × 3 × 5

⇒ 120 = 2 × 2 × 2 × 3 × 5

Hence LCM of 60,120 = (2 × 2 × 3 × 5)

LCM of 60,120 = 120

So after 60 seconds they will change simultaneously

We know that

120 seconds = 2 minute

∴ The time = 8:30 a.m. + 2 minutes

Hence the lights change simultaneously at 8:32 am

.

.

.

.

.

hope it helps