Kamal and Lalit start from a point on a 1200 m track, Kamal clockwise at 7 m/s and Lalit anticlockwise at 5 m/s. Each time they meet, Kamal slows down by 2 m/s while Lalit keeps his pace, and both keep their directions. After how many seconds do they meet for the third time?

Question

Accepted Answer

370 s. Gaps between meetings: 1200/7+5=100 s, then 1200/5+5=120 s, then 1200/3+5=150 s. Third meeting =100+120+150=370 s. (300 s ignores the slowing down.)

Kamal and Lalit start from a point on a 1200 m track, Kamal clockwise at 7 m/s and Lalit anticlockwise at 5 m/s. Each time they meet, Kamal slows down by 2 m/s while Lalit keeps his pace, and both keep their directions. After how many seconds do they meet for the third time?

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