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14 Feb 2020, 05:34
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B
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Difficulty:
5%
(low)
Question Stats:
89% (01:19) correct
11%
(01:45)
wrong
based on 179
sessions
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Both Robert and Alice leave from the same location at 7:00 a.m. driving in the same direction, but in separate cars. Robert drives 30 miles per hour while Alice drives 40 miles per hour. After 6 hours, Alice’s car stops. At what time will Robert’s car reach Alice’s car?
A. 1 p.m.
B. 3 p.m.
C. 4 p.m.
D. 8 p.m.
E. 9 p.m.
A. 1 p.m.
B. 3 p.m.
C. 4 p.m.
D. 8 p.m.
E. 9 p.m.
14 Feb 2020, 06:53
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Bunuel
Robert Speed = 30
Alice Speed = 40
Relative Speed = 40-30 = 10 miles/hour
The distance between then in 6 hours (when Alice stops) = 10*6 = 60 miles
Time taken by Robert to reach Alice's car = 60/30 = 2 hours
i.e. (6 hours + 2 hours) from 7 AM
i.e. 3 PM
Answer: Option B
Archit3110
Major Poster
14 Feb 2020, 23:37
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total distance covered by Alice in 6 hrs ; 6*40 ; 240 miles
and distance covered by Robert in 6 hrs ; 6*30 ; 180 miles
net ∆ of distance; 60 miles which Robert at its speed will cover in 60/30 ; 2 hrs more
so time Alice had reached 240 miles ; 1PM and + 2 hrs ; 3 PM is time when Robert meets Alice
IMO B
and distance covered by Robert in 6 hrs ; 6*30 ; 180 miles
net ∆ of distance; 60 miles which Robert at its speed will cover in 60/30 ; 2 hrs more
so time Alice had reached 240 miles ; 1PM and + 2 hrs ; 3 PM is time when Robert meets Alice
IMO B
Bunuel
