Sonia's house is on the fourth floor. She climbs the stairs every day and feels tired at times,
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When you start climbing, you're essentially doing single-leg squats with some cardio mixed in, and your heart rate quickly skyrockets. Your body suddenly needs more oxygen -- hence the feeling of being winded.
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Sonia and Ravi start from the same point, at same time and in same direction. So they meet again after lcm of the times taken by them individually.
To get the LCM we have to factorize the numbers,
Factors of 18=2×3×3
Factors of 12=2×2×3
LCM =2×2×3×3=36
Hence, they will meet together at the starting point after 36 minutes.
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