A man complete a journey in 10 hours. He travels first half of the journey at th

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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.

Options:

A . 220 km

B . 224 km

C . 230 km

D . 234 km

Answer: Option B

(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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