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4 x 300 = 1200m

400 – 300 = 100

1200/100 = 12min

12 x 400 = 4800m or

16 x 300 = 4800m ans

 

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Mandy runs 4 minutes earlier

300 x 4 = 1200 (Hence, Mandy has already run 1200 m before Lincoln started)

400 – 300 = 100 (For each minute, Lincoln runs 100 m more)

1200 / 100 = 12 (It takes 12 minutes for Lincoln to catch up to Mandy)

12 + 4 = 16 

16 x 300 = 4800m

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