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Explanation:
1. speed = 150/18 = 25/3 m/s
2. average speed = total distance / total time
= (4 +2+1)/ 70 = 7/70 = 0.1Km /min.
3.average speed = 120 / 2.5 = 240/ 5 = 48 Km /hr
4. average speed = distance / time
distance = average speed x time
= 600 x 2.5 = 1500Km.
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