Time & distance

Quantitative Aptitude (CGL)

Title

45:30

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Indian Economy - Understanding the basics of Indian economic system

Walking at $_{5}^{3}$ of his usual speed, a person reaches his office 20 minutes late than the usual time. His usual time in minutes is:

This questions was previously asked in

SSC CGL 12 June 2019 Shift-3

since distance is constant. So, time is inversely proportional to speed.
ratio of the speed = 5 : 3
ratio of the time = 3 : 5

Let the usual time is and delayed time is . 5x
From question, time difference is 20min.
⇒ 5x − 3x= 20 min

⇒ x = 10min
Usual time = 3 × 10 = 30min