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20 Apr 2016, 22:47
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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:
25%
(medium)
Question Stats:
78% (01:53) correct
22%
(01:41)
wrong
based on 125
sessions
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In a car race between A and B over a distance of 60 miles, B gives an hour lead to A. If A finishes the race in 4 hour assuming both A and B travel at constant speed, how much time does B take?
(1) B crosses A in exactly one hour.
(2) B finishes the race one hour before A.
Self Made
(1) B crosses A in exactly one hour.
(2) B finishes the race one hour before A.
Self Made
20 Apr 2016, 23:22
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Given: B gives an hour lead to A.
A finishes in 4 hours
Distance = 60 miles
St1: B crosses A in 1 hour --> When B crosses A, time taken by A = 2hrs; time taken by B = 1hr
Hence, Speed of B is double the speed of A
If A takes 4 hours, B takes 2 hours to complete.
Sufficient
St2: Time taken by A = 4
B leaves 1 hour after A and completes 1 hour before A --> Time taken by B = 2 hours.
Sufficient
Answer: D
A finishes in 4 hours
Distance = 60 miles
St1: B crosses A in 1 hour --> When B crosses A, time taken by A = 2hrs; time taken by B = 1hr
Hence, Speed of B is double the speed of A
If A takes 4 hours, B takes 2 hours to complete.
Sufficient
St2: Time taken by A = 4
B leaves 1 hour after A and completes 1 hour before A --> Time taken by B = 2 hours.
Sufficient
Answer: D
stonecold
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21 Apr 2016, 16:24
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Nice and tricky
Here let speed of car B be x mph
now speed of car A = 15mph
we need to get x as then we can use time = 60/x
from 1 => x = 30 => time = 60/30 => 2 hours.
hence sufficient.
from 2 => time = 3hours total => 3-1 (for the lead) hence 2 hours
.so D is my choice
Part two here is excellent. i bet if it were a PS question for part two how many of us would solve that
regards
StoneCold
Here let speed of car B be x mph
now speed of car A = 15mph
we need to get x as then we can use time = 60/x
from 1 => x = 30 => time = 60/30 => 2 hours.
hence sufficient.
from 2 => time = 3hours total => 3-1 (for the lead) hence 2 hours
.so D is my choice
Part two here is excellent. i bet if it were a PS question for part two how many of us would solve that
regards
StoneCold
