At 5.45pm, lixin, khairul and devi are at the starting point of a 1km circular path. lixin takes 18 minutes to walk one round. khairul needs 360 seconds to run 1 round and devi cycles 2 rounds in 4 minutes. find the time when all three of them will next meet.

They will meet next at 6:03 pm

Step-by-step explanation:

Lixin, Khairul and Devi are at the starting point of a 1 km circular path at 5:45 pm.

We will convert time taken by each person in seconds for one round.

Lixin takes time to walk one round = 18 minutes = 18 × 60 = 1080 seconds.

Khairul completes one round in = 360 seconds

Devi completes two round in = 4 minutes = = 2 minutes = 120 seconds.

Time taken by each person for one round

Lixin = 1080 seconds

Khairul = 360 seconds

Devi = 120 seconds

Now use LCM ( Lowest common multiple ) to find the time when all three will next meet.

LCM of 1080, 360, 120

= 2 × 2 × 2 × 3 × 3 × 3 × 5

= 2³ × 3³ × 5 = 1080 seconds

= 18 minutes

After 18 minutes of 5:45 pm = 6:03 pm

They will meet next at 6:03 pm

to plot points   for x just start at the origin (middle) and go to the left however many times it say(if the number is a positive) if the number is a negative then go right however many times it says if it is 0 go nowhere

now keep you pencil there and go up however many times it says on y(if it is positive) if it is negative then go down however many times it says. if it says 0 go nowhere.

you have just plotted a point! now when you finish plotting all of them connect them with a ruler

plot each point as (-3, 7), (0,4), (3,1), (8,-4)   in the parenthesis on the left of the comma is x and the right is y.