Aptitude:: Time and Distance

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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

Answer: Option B

Explanation:

 

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

 

x + x = 20
21 24

 

 15x = 168 x 20

 

 x = 168 x 20 = 224 km.
15

 


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