the speed of man swimming in still water is 6km/hr. if the speed of stream is 3km/hr, find the time he takes:
I) 3000m downstream
ii) 2km upstream
Answers
Answered by
0
Answer:
tharit four
jhhjjhhhjjknbb
Answered by
1
Step-by-step explanation:
swimming speed of man is 3km/h.
river flow speed is 2km/h.
To reach the point directly opposite to his stating point.
sinθ=2/3
θ=sin
−1
(
3
2
)
θ=41.7
∘
As the man has to reach directly of opposite to his stating point
then the angle has to lre. 90+θ.
∴ Required angle is 90+θ=131.7
∘
90+41.7=131.7
(b) time to cross the rived is .
T=
speed
distance
=
5
500×10
−3
=
5
500×10
−3
×
5
5
(speed of man w.r.t rives)
T=
5
×100×10
−3
=0.1×
5
hours.
T=13.4 minutes.
Similar questions