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A motor vehicle travelled the first 1/3 of a distance s lit a speed of v_(2)=20 kmph and the last 1/3 at a speed of v_(3)=10kmph.Determine the mean speed of the vehicle over the entire distance is. |
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Answer» Solution :`v_(1)`=10kmph,`v_(2)`=20,`v_(3)`=60,V=? `(3)/(v)=(1)/(v_(1))+(1)/(v_(2))+(1)/(v_(3)),(3)/(v)=(1)/(10)+(1)/(20)+(1)/(20)+(1)/(60)=0.1+0.05+0.016` `therebore V=(3)/(0.166)`=18 kmph |
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