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16 Aug 2019, 01:10
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D
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Difficulty:
25%
(medium)
Question Stats:
76% (01:32) correct
24%
(02:12)
wrong
based on 279
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It takes 2 hours to travel 20 miles downstream on a cruise ship that travels at a constant speed along a river flowing at a speed of 2 miles per hour. How long will it take for the cruise ship to travel 18 miles upstream on this river?
A. 1 h 30 min
B. 2 h
C. 2 h 30 min
D. 3 h
E. 3 h 30min
A. 1 h 30 min
B. 2 h
C. 2 h 30 min
D. 3 h
E. 3 h 30min
16 Aug 2019, 02:54
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Speed of the ship=v
20= 2*(v+2)
v=8
Speed of the ship against the flow= v-2=6
Time taken= 18/6=3hrs
20= 2*(v+2)
v=8
Speed of the ship against the flow= v-2=6
Time taken= 18/6=3hrs
MathRevolution
Archit3110
Major Poster
17 Aug 2019, 11:01
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MathRevolution
for downstream the speed of ship would be ; 20 =2*(x+2)
x = 8 mph
so for upstream speed of boat ; 8-2 ; 6mph
so time it would take to cover 18 miles ; 18/6 ; 3 hrs
IMO D
