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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.

A. 220 km

B. 224 km

C. 230 km

D. 234 km

Correct Answer : B.


(1/2)x21 + (1/2)x24 = 10
⇒x21 + x24 = 20
⇒15x = 168 x 20
⇒x = 168 x 2015 = 224 km.

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