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a=20 is the answer for your question dear
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Explanation:
distance is given by the area under speed- time graph.
a. area= 15 × (40 - 30) = 15 × 10 =150 km
b. area = 15 × (40 - 10) = 15 × 30 = 450 km
c. speed over here is constant which is 15km/h
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