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Scorpion4ik [409]
3 years ago
13

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. K

hairul 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.

Mathematics
2 answers:
almond37 [142]3 years ago
4 0

Answer:

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 = \frac{4}{2} = 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

\frac{1080}{60} = 18 minutes

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

They will meet next at 6:03 pm

hichkok12 [17]3 years ago
3 0
Here you go 
hope this helps

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