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blowice27
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04 Oct 2019, 09:52
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The XYZ river flows at 12 km/hr. A boy who can row at 25/18 m/s in still water had to cross it in the least possible time. The distance covered by the boy is how many times the width of the river XYZ?
A. 2.1
B. 2.3
C. 2.6
D. 2.9
E. 3.0
A. 2.1
B. 2.3
C. 2.6
D. 2.9
E. 3.0
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04 Oct 2019, 10:13
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blowice27
The XYZ river flows at 12 km/hr. A boy who can row at 25/18 m/s in still water had to cross it in the least possible time. The distance covered by the boy is how many times the width of the river XYZ?
A. 2.1
B. 2.3
C. 2.6
D. 2.9
E. 3.0
Speed of the river XYZ = 12 kmphA. 2.1
B. 2.3
C. 2.6
D. 2.9
E. 3.0
Speed of the boy = 5 kmph
Let the time taken by the boy to cross the river in still water = T
Width of the river = 5T
The boy takes the least time when he is travelling directly across the river.
But the river current pushes him in a direction perpendicular to the flow,
Distance travelling along the river = 12T
Effective distance travelled by boy = √(12T)2+(5T)2=13T
⇒
Distance covered by the boy
width of the river
=
13T
5T
= 2.6
Posted from my mobile device
05 Apr 2020, 08:56
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Quote:
.Effective distance travelled by boy = √(12T)2+(5T)2=13T
⇒
Distance covered by the boy
width of the river
=
13T
5T
= 2.6
Posted from my mobile device
⇒
Distance covered by the boy
width of the river
=
13T
5T
= 2.6
Posted from my mobile device
I'm not following this part can you please rewrite this out??? TY
