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(a)

If both start at the same time, Mark would have covered 540m when Joseph covered 270m. Given Mark started 10s late and covered 180m when Joseph is at 270m mark, it means Mark could have traveled 360m in 10s. Hence to cover 540m, he would need 15s

(b)

Mark average speed = 540 / 15 = 36 m/s

Joseph average speed = half of Mark’s = 18 m/s 

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