Mechanics> relative motion...

A hunter wishes to cross a river that is 1.5km wide and flows with a velocity of 5km/h parallel to its bank.The hunter uses a small powerboat that moves at a maximum speed of 12km/h with respesct to the water.What is the minimum time for crossing?

aryan agarwal , 15 Years ago

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1 Answers

vijesh jayan

LET V_wBE THE SPEED OF BOAT

AND V_BBE THE SPEED OF WATER

AND V_BW=V_B-V_W-- (1)

GIVEN THAT V_W=5Km/h

& V_BW=12Km/h

& distance between the banks=1.5Km

FROM Eq (1)

12=V_B-(-5)

=V_B+5 → V_B=7Km/h

T=[DISTANCE OF THE BANKS]/V_B

T=1.5/7

T=0.214 hrs =12.85 min

is what i think

I am not sure with this sum

Last Activity: 15 Years ago

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Mechanics> relative motion...

A hunter wishes to cross a river that is 1.5km wide and flows with a velocity of 5km/h parallel to its bank.The hunter uses a small powerboat that moves at a maximum speed of 12km/h with respesct to the water.What is the minimum time for crossing?

aryan agarwal , 15 Years ago

vijesh jayan

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