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Track length = 750 m
Speeds: X = 9 km/h = 2.5 m/s, Y = 13.5 km/h = 3.75 m/s
Relative speed (same direction) = 3.75 − 2.5 = 1.25 m/s
Time to meet = 750 ÷ 1.25 = 600 seconds = 10 minutes
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