Walking 3/4th 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
Explanation: Say distance =x meters
usually he takes t sec
usual speed v = x/t m/sec ———(1)
3v/4 = x/(t+10) —————(2)
=> 4/3 = (t+10)/t
=>t =30 sec
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