a boy rides his bicycle 10km at an average speed of 12 km/hr. and again travel 12 km at an average speed of 10 km/hr his average speed for dntire trip is approximately a)10.4km/hr b)10.8km/hr c)12.2km/hr d)11.2km/hr


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Question Number 32209 by Raja1 last updated on 21/Mar/18

$a b o y r i d e s h i s b i c y c l e 10 k m a t a n a v e r a g e s p e e d o f 12 k m / h r .$ $a n d a g a i n t r a v e l 12 k m a t a n a v e r a g e s p e e d o f 10 k m / h r$ $h i s a v e r a g e s p e e d f o r d n t i r e t r i p i s a p p r o x i m a t e l y$ $a) 10.4 k m / h r$ $b) 10.8 k m / h r$ $c) 12.2 k m / h r$ $d) 11.2 k m / h r$
	Answered by MJS last updated on 21/Mar/18

	$10 k m a t 12 k m / h r \Rightarrow 5 / 6 h r$ $12 k m a t 10 k m / h r \Rightarrow 6 / 5 h r$ $22 k m i n 5 / 6 + 6 / 5 = 61 / 30 h r \Rightarrow$ $\Rightarrow 22 \times 30 / 61 \approx 10.8 k m / h r$
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