A man complete a journey in 10 hours. He travels first half of the journey at the rate of 21 km/hr and second half at the rate of 24 km/hr. Find the total journey in km.

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(1/2)x	+	(1/2)x	= 10
21		24

⟹ x =	❨	168 x 20	❩	= 224 km.
		15