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10 Jan 2020, 04:39
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C
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Difficulty:
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Question Stats:
75% (01:13) correct
25%
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wrong
based on 198
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A boat covers a distance of 16 km in 2 hours when rowing downstream and in 4 hours if rowing upstream. What is the speed of the boat in still water?
A. 2 km/hr
B. 4 km/hr
C. 6 km/hr
D. 8 km/hr
E. 10 km/hr
A. 2 km/hr
B. 4 km/hr
C. 6 km/hr
D. 8 km/hr
E. 10 km/hr
10 Jan 2020, 04:50
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V —speed of the boat
x— speed of stream
What is the speed of the boat in still water?(V—???)
(V +x)*2 = 16
(V—x)*4= 16
—> V+ x = 8
—> V—x= 4
2V= 12 —> V=6
The answer is C
Posted from my mobile device
x— speed of stream
What is the speed of the boat in still water?(V—???)
(V +x)*2 = 16
(V—x)*4= 16
—> V+ x = 8
—> V—x= 4
2V= 12 —> V=6
The answer is C
Posted from my mobile device
10 Jan 2020, 06:01
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Downstream speed = 16/2 = 8 kmph
Upstream speed = 16/4 = 4 kmph
Speed of boat = (DS + US)/2 = (8 + 4)/2 = 6 kmph.
As additional infornation :
Speed of stream = (DS - US)/2 = (8 - 4)/2 = 2 kmph.
Upstream speed = 16/4 = 4 kmph
Speed of boat = (DS + US)/2 = (8 + 4)/2 = 6 kmph.
As additional infornation :
Speed of stream = (DS - US)/2 = (8 - 4)/2 = 2 kmph.
