A motor car starts with a speed of 70 , km/hr | vedclass

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(C) In the first $2 \, hours$,the distance covered is $70 	imes 2 = 140 \, km$.In the next $2 \, hours$,the speed increases to $80 \, km/hr$,so the d

Vedclass · Accepted Answer

$4\frac{1}{2} \, hours$

Vedclass · Answer

(C) In the first $2 \, hours$,the distance covered is $70 	imes 2 = 140 \, km$.In the next $2 \, hours$,the speed increases to $80 \, km/hr$,so the distance covered is $80 	imes 2 = 160 \, km$.Total distance covered in $4 \, hours = 140 + 160 = 300 \, km$.Remaining distance to be covered $= 345 - 300 = 45 \, km$.In the next interval,the speed increases to $90 \, km/hr$.Time taken to cover the remaining $45 \, km$ at $90 \, km/hr = \frac{45}{90} = 0.5 \, hours$.Total time taken $= 4 + 0.5 = 4.5 \, hours$ or $4\frac{1}{2} \, hours$.

$A$ motor car starts with a speed of $70 \, km/hr$ with its speed increasing every $2 \, hours$ by $10 \, km/hr$. In how many hours will it cover $345 \, km$?

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