Question

Hey.....

On MG road, three consecutive traffic lights

change after 36, 42 and 72 seconds. If the lights are

first switched on at 9:00am, at what time will they

change simultaneously?(2 marks)

I want explanation

Answer with explanation will be marked as Brainlist!!!!!​

Answer 1

Answer:

9:08:24

Step-by-step explanation:

I'll give u the simplest trick to solve this.

The color change every 36, 42 and 72 sec.

First, Find out the lowest common multiple (LCM) of these nos.

LCM of 36, 42, 72 = 504 = 8 min 24 sec

This mean that the traffic lights will change simultaneously every 504 sec.

They were first switched at 9:00 am

The head lights will first change simultaneously at 9:00am + 8min24 sec = 9:08:24