Speed, Time, Distance : CAT 2016 Online Preparation
Question 4 the day : June 18, 2003
The question for the day is from the topic Time and Distance. The question helps get a good grasp on the concept that time is inversely proportional to speed.
Question
By walking at 3/4 ^{th} of his usual speed, a man reaches office 20 minutes later than usual. What is his usual time?
 30 min
 60 min
 70 min
 50 min
Correct Answer is 60 min. Choice (2) is right.
Explanatory Answer
3/4 of a man's usual speed means, he takes 4/3 of his usual time to cover the same distance, i.e. he takes 4/3  1 = 1/3 time extra.
1/3 time is 20 minutes (given)
Usual time = 20 * 3 = 60 minutes.
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