QA – Placement Quizzes | Time Speed Distance | Question 13

Walking 3/4^th of his speed, a person is 10 sec late to his office. Find his usual time to cover the distance?
(A) 40 sec
(B) 25 sec
(C) 45 sec
(D) 30 sec

Answer: (D)
Explanation: Say distance =x meters
usually he takes t sec

usual speed v = x/t m/sec ———(1)

3v/4 = x/(t+10) —————(2)

(1)/(2)

=> 4/3 = (t+10)/t

=>t =30 sec

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