He went to work by his car at speed 120 km/hr and back home the same way 90 km/hr, find the average speed for the entire distance traveled.


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Question Number 183457 by Acem last updated on 26/Dec/22

$H e w e n t t o w o r k b y h i s c a r a t s p e e d 120 k m / h r$ $a n d b a c k h o m e t h e s a m e w a y 90 k m / h r, f i n d t h e$ $a v e r a g e s p e e d f o r t h e e n t i r e d i s t a n c e t r a v e l e d .$
	Answered by Matica last updated on 26/Dec/22


	Commented by Matica last updated on 26/Dec/22

	Commented by Acem last updated on 26/Dec/22

	$T h x M r! c o r r e c t, a n d {i t}^{'} s b e t t e r r o u n d e d i t t o c l o s e$ $n u m b e r s u c h 102.857 i s c l o s e r t o 103 . T h a n k y o u$
	Answered by mr W last updated on 26/Dec/22

	$v_{t o t a l} = \frac{2 d}{\frac{d}{v_{1}} + \frac{d}{v_{2}}} = \frac{2 v_{1} v_{2}}{v_{1} + v_{2}}$ $= \frac{2 \times 120 \times 90}{120 + 90} \approx 103 k m / h$
	Commented by Acem last updated on 26/Dec/22

	$T h a n k s M r!$
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