Question

it takes ken 80 seconds to complete a lap and hamid 60 seconds to complete a lap .they start at the same time how many laps will they have run till the next meet at the start line
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Answer 1

Answer:  Ken will run 3 laps and Hamid will run 4 laps till they next meet at the start line.

Step-by-step explanation:

Given: It t takes Ken 80 seconds to complete a lap and Hamid 60 seconds to complete a lap .

To find when they, meet we need to find the least common multiple of 80 and 60.

Since $80=4\times20\\60=3\times20$

Therefore, LCM(60,80)= $4\times3\times20=240$

Thus they will meet after 240 seconds.

So the number of laps completed by Ken= $\frac{240}{80}=3$

The number of laps completed by Hamid= $\frac{240}{60}=4$