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A car travels 30km at a …

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A car travels 30km at a uniform speed of 40km/hour and the next 30km at a uniform speed of 20km/hour. Find its average speed

    • Posted by Rohit Rocks 7 years, 8 months ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Devansh Baardwaj 7 years, 8 months ago

    Distance first =30km Speed first =40km/hr First time =Distance÷time =30÷40 =3/4 hr Distance second =30km Speed second = 20km/hr Second time =distance ÷speed =30÷20 =3/2hr Total distance =30km+30km =60km Total time =3/2+3/4 =9/4 hr Av. Speed =total distance÷total time = 60÷9/4 =240/9 km/hr

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