Arithmetic Aptitudes › Time and Distance › Question #4710
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QA man completes a 5-hour trek. He travels at a pace of 20 km/hr for the first part of the voyage and 25 km/hr for the second half. What is the entire distance in kilometres?

ID: #4710 Time and Distance 146 views
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#4710Q ID
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Time and DistanceTopic
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  • A 6.4 km ✔ ✖
  • B 5.4 km ✔ ✖
  • C 4.4 km ✔ ✖
  • D 3.4 km ✔ ✖
Correct Answer: Option B

Explanation


Distance covered in first half = Distance covered in second half

Distance covered in first half = speed * time→20*X=20X

Distance covered in second half = speed * time→25 * (5-X)

So, 20X = 25 * (5-X)

20X = 125 -25X

45X = 125

X= 125⁄45= 2.7 km

X is the distance covered in first half which is equal to the distance covered in the second half.

So to get the total journey we will multiply X with 2.

Total journey in Km = 2.7 x 2 = 5.4 km
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