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What is the correct answer?
4
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. 224 km
$\frac{(1/2)x}{21}+\frac{(1/2)x}{24}=10$
$\Rightarrow \frac{x}{21}+\frac{x}{24}=20$
$\Rightarrow 15x=168x20$
$\Rightarrow x=\left(\frac{168x20}{15}\right)=224km.$
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