Azhar can complete a journey in 10 hours. He travels the first half of the journey at a speed of 21 km/h. and the balance at 24 km/h. Find the total distance in km?

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RRB Non Technical Exam (Secunderabad) 2016 click here to view all questions

Azhar can complete a journey in 10 hours. He travels the first half of the journey at a speed of 21 km/h. and the balance at 24 km/h. Find the total distance in km?

A244

B224

C221

D230

rahul ? Jan 14 '2020 at 9:28

Correct answer is: 224

Explanation:

\(\frac{(1/2)x}{21}+\frac{(1/2)x}{24}=10\)

⇒\(\frac{x}{21}+\frac{x}{24}=20\)

⇒\(15x=168×20\)

⇒\(x=\frac{168×20}{15}\)

\(⇒x=224\text{ km}\)

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Correct answer is: 224 Explanation: \(\frac{(1/2)x}{21}+\frac{(1/2)x}{24}=10\) ⇒\(\frac{x}{21}+\frac{x}{24}=20\) ⇒\(15x=168×20\) ⇒\(x=\frac{168×20}{15}\) \(⇒x=224\text{ km}\) rahul ? answered Jan 14 '2020 at 9:28 All Comments

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