Time and Distance - Quantitative Aptitude (MCQ) questions for Q. 705

Q.   If Ajay drives at 4/5th of his usual speed to his office, he is 6 minutes late. What is his usual time to reach his office?
- Published on 06 Jul 15

a. 36
b. 24
c. 30
d. 18

ANSWER: 24
 
Let t be his usual time to reach his office and v be his usual speed.
v = d/t ……….(d is the distance Ajay travels while going to his office)
vt = d
At v1 = 4v/5 ; t1 = t + 6
4v/5 = d/(t + 6)
4v/5* (t + 6) = d
4v/5* (t + 6) = vt
On solving we get,
t = 24 minutes

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