Best Answer

8:01 PM.

After 60 seconds . . .

Light #1 flashes (60/20) = 3 more times: 8:00:20, 8:00:40, and 8:01.

Light #2 flashes (60/30) = 2 more times: 8:00:30 and 8:01.

They coincide at 8:01.

User Avatar

Wiki User

โˆ™ 2010-01-17 05:58:25
This answer is:
User Avatar
Study guides
See all Study Guides
Create a Study Guide
More answers
User Avatar


Lvl 1
โˆ™ 2020-09-06 09:19:03

solution ;

LCM of 20 and 30



LCM of 20 and 30 = 2*2*3*5


60 seconds=1 minute

The two lighthouses will next flash together at 8:01

User Avatar

Add your answer:

Earn +20 pts
Q: Two lighthouse flash their lights every 20 seconds and 30 seconds respectively Given that they flash together at 8 pm when will they next flash together?
Write your answer...
Related questions

Do lighthouse lights turn?

if they are mechanical strobe lights- yes.

Where is the Christmas lights in Fantage?

They are by the lighthouse

Where is the Christmas lights on Fantage?

the Lighthouse

How do you light the lights in the lighthouse?

turn it on

What is the signal pattern for the Cape Hatteras Lighthouse?

1 white flash every 7.5 seconds. See

What is a House that lights a ship's way?

A lighthouse.

House that lights a ships way?

a lighthouse

House that lights a ship's way?


What is a house that lights a ship's way called?

A lighthouse.

What job can you get that revolves around lights?

You could get a job as a lighthouse?

The red lights on your holiday decorations blinkevery 6 seconds The blue ones blink every 8 seconds After you first plug in the lightshow long will it be until they blink together for the second time?

It will take 24 seconds until they blink together for the second time

What is a compound word for house that lights a ship way?

Lighthouse is a compound word.

What are some of Edward Hoppers paintings?

the lighthouse at two lights and night hawks

What is the duration of Hollywood Lights?

The duration of Hollywood Lights is 1200.0 seconds.

What Are Lighthouse Lights For?

So the ships can see the rocks before they go and crash into them mate

Are there any major man-made landmarks in Rhode Island?

Beavertail LighthouseBlock Island North LighthouseBlock Island South LighthouseBristol Ferry LighthouseConanicut LighthouseConimicut LighthouseHog Island Shoal LightsPoint Judith LighthousePrudence Island Lighthouse

What is the purpose of the light house?

A lighthouse lights up the sea for captains to get to land safely. At night, you only got the moon to direct you, but if you see a lighthouse from far out the sea, you can get guided towards it.

Why does cape lookout lighthouse have a diamond design?

Each of the lights are painted with unique daymark patterns to distinguish them.

What is the duration of Northern Lights TV series?

The duration of Northern Lights - TV series - is 3600.0 seconds.

How do you turn the audible beep on and flashing lights when you are locking doors for a 2005 Infiniti G35 using the keyless entry remote?

Hold down the lock and unlock buttons, on the key fob, together for several seconds and the system will change to lights with horn.

What does an automated lighthouse do?

An automated lighthouse warns shipping of hazards such as rocks.It is not manned & turns its warning lights on & off by way of a timer.It is serviced every so often to make sure everything is working correctly. Nowadays most are computer controlled.Originally they would be run manually. with Lighthouse Keepers living in the lighthouse itself.They were responsible for the upkeep of the whole system.

What is caused by charged particles from the sun entering earths magnetic field?

The Northern and Southern lights, respectively.

How far is the earth from the sun in light seconds?

The Earth is about 8.317 light minutes, or 499 lights seconds, away from the sun.

What time do lighthouses switch on?

Times vary with the seasons and the times of sunset, but generally lighthouse lights come on at sunset, and before it is dark.

The two neon lights are turned on at the same timeBoth signs blink as they are turned on one every nine seconds the other blinks every 15 seconds in how many seconds will they blink together again?

15+15+15=45, 9+9+9+9+9=45They will blink together in 45 seconds. the 9-second one will have blinked 5 times and the 15-second one will have blinked 3 times.

People also asked

What is the smallest natural number that has exactly five factors?

View results

Is 46 a multiple of 6?

View results

78 to 780 as a fraction in simplest form?

View results

What is 78 out of 780 as a fraction in simplest form?

View results