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14 Mar 2017, 23:09
Kudos
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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:
88% (00:56) correct
12%
(01:43)
wrong
based on 235
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Two trains, which are 600 miles apart, are heading toward each other on a straight track. One train is heading due east at 70 miles per hour and the other is heading due west at 80 miles per hour. How much time do the conductors have to stop the trains before they collide (assuming the trains can be stopped instantaneously)?
A. 3 hours
B. 4 hours
C. 5 hours
D. 9 hours
E. 11 hours
A. 3 hours
B. 4 hours
C. 5 hours
D. 9 hours
E. 11 hours
14 Mar 2017, 23:26
Kudos
Bookmarks
total speed is :- 150 mph
distance is 600 m
time = 600/150 = 4 hours
conductors have 3 hours to stop as in 4 th hour they will collide...hence A
distance is 600 m
time = 600/150 = 4 hours
conductors have 3 hours to stop as in 4 th hour they will collide...hence A
14 Mar 2017, 23:49
Kudos
Bookmarks
as per the solution mentioned above,
total speed is :- 150 mph
distance is 600 m
time = 600/150 = 4 hours
conductors have 3 hours to stop as in 4 th hour they will collide...hence A
the time calculated as 4 hours is correct, making B as correct answer choice. As mentioned in the question, the train can be stopped instantaneously, no time will be required to stop the train and hence 4 is the time required.
total speed is :- 150 mph
distance is 600 m
time = 600/150 = 4 hours
conductors have 3 hours to stop as in 4 th hour they will collide...hence A
the time calculated as 4 hours is correct, making B as correct answer choice. As mentioned in the question, the train can be stopped instantaneously, no time will be required to stop the train and hence 4 is the time required.
