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09 Jun 2021, 02:15
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
92% (01:21) correct
8%
(01:55)
wrong
based on 163
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The length of a circular track is 1200 metres. Two people are running around it at 100 m/min and 200 m/min respectively in the same direction. When will both meet at the starting point for the first time?
(A) After 10 minutes
(B) After 12 minutes
(C) After 14 minutes
(D) After 16 minutes
(E) After 18 minutes
(A) After 10 minutes
(B) After 12 minutes
(C) After 14 minutes
(D) After 16 minutes
(E) After 18 minutes
09 Jun 2021, 09:00
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- • Length of track = 1200 m
• Speed of 1st person = 100 m/min
o Time taken by 1st person to cover 1 round = \(\frac{1200}{100}\) = 12 min.
• Speed of 2nd person = 200 m/min
o Time taken by 2nd person to cover the track = \(\frac{1200}{200}\) = 6 min.
• In 12 min 1st person will cover the track exactly 1 time and 2nd person will cover the track exactly 2 times.
• After 12 min both the persons will at the starting point.
09 Jun 2021, 09:59
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Bunuel
The faster person runs faster by 100 meters every min. Since the track is 1200 meters, after 12 minutes the faster person will have ran faster by 1200 meters, which is exactly one lap.
Ans: B
