16 A car covers the first half distance of a journey at a constant speed of 60 km hr and the next half at a constant speed of 40 km hr. Find its average speed. (a) 40 km hr - 1 (b) 50 km hr-1 (c) 60 km hr-1 (d) 48 kmhr-1

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ara sped wolen sem dutome is travy 4)( =-60+40 ) ( =frac{2 times 60 times 40}{100} ) se ( =48 mathrm{km} / mathrm{lm} ) ded os doton D

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