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

Therefore, LCM(60,80)=

Thus they will meet after 240 seconds.
So the number of laps completed by Ken=

The number of laps completed by Hamid=
