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23 Feb 2017, 16:37
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
75% (02:10) correct
25%
(02:42)
wrong
based on 218
sessions
History
Date
Time
Result
Not Attempted Yet
Tube 1 drops 2 marbles per minute starting at 8:05. Tube 2 drops 5 marbles per minute starting at 8:23. If Jerry needs 400 marbles from the tubes, at what time will he get the 400 marbles?
A) 8:57
B) 9:05
C) 9:07
D) 9:15
E) 9:25
A) 8:57
B) 9:05
C) 9:07
D) 9:15
E) 9:25
23 Feb 2017, 19:27
Kudos
Bookmarks
duahsolo
Tube 1 drops 2 marbles per minute starting at 8:05. Tube 2 drops 5 marbles per minute starting at 8:23. If Jerry needs 400 marbles from the tubes, at what time will he get the 400 marbles?
A) 8:57
B) 9:05
C) 9:07
D) 9:15
E) 9:25
A) 8:57
B) 9:05
C) 9:07
D) 9:15
E) 9:25
he will get upto 8:23 = 17minutes*2 marbles =34
from 8:23 he will collect @ 7marbles /minute
thus he will collect 366 (400-34) marbles in
366/7 min.= ~52.3minutes
thus time taken = 8:23 + 52.18minutes
= ~9:15
Ans D
16 Mar 2017, 16:27
Kudos
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18 mins pass before the two tubes start working together. up until that point 18*2= 36 marbles are collected. this means another 364 marbles are needed.
7 marbles are collected from the two tubes per min. so 364/7 = 52 mins more mins are needed to collect all the marbles. 23 + 52 = 75 mins= 1 hr 15 min. so from from 8:00 add 1 hr 15 mins = 9:15.
7 marbles are collected from the two tubes per min. so 364/7 = 52 mins more mins are needed to collect all the marbles. 23 + 52 = 75 mins= 1 hr 15 min. so from from 8:00 add 1 hr 15 mins = 9:15.
