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12 Dec 2018, 03:21
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
78% (01:53) correct
22%
(02:09)
wrong
based on 325
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The average speed of a certain train was measured every 6 minutes and was found to have increased by 3 miles per hour during each successive 6-minute interval after the first
interval. If in the third 6-minute interval its speed was 24 miles per hour, how many miles did the train travel in the first 6-minute interval?
A. 0.6
B. 1.2
C. 1.8
D. 2.4
E. 3.0
interval. If in the third 6-minute interval its speed was 24 miles per hour, how many miles did the train travel in the first 6-minute interval?
A. 0.6
B. 1.2
C. 1.8
D. 2.4
E. 3.0
Archit3110
Major Poster
Updated on: 12 Dec 2018, 07:15
Originally posted by Archit3110 on 12 Dec 2018, 03:28.
Last edited by Archit3110 on 12 Dec 2018, 07:15, edited 1 time in total.
Last edited by Archit3110 on 12 Dec 2018, 07:15, edited 1 time in total.
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Bunuel
speed in third 6 min interval is 24 mph
so in first 6 min it would have been 18 mph
distance in miles covered in first 6 min = 18*6 /60 = 1.8miles .. IMO C
12 Dec 2018, 07:06
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If the 3rd interval was 24mph, then the 2nd interval was 21mph and the first interval 18mph. 6min*1hr/60min=1/10hr*18mph= 1.8 miles so choice C? Please correct me if my logic is wrong. Thank you.
