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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?

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?

Grade:

1 Answers

vijesh jayan
49 Points
10 years ago

LET Vw BE THE SPEED OF BOAT

AND VB BE THE SPEED OF WATER

AND VBW=VB-V-- (1)

GIVEN THAT VW=5Km/h

& VBW=12Km/h

& distance between the banks=1.5Km

FROM Eq (1)

12=VB-(-5)

    =VB+5 → VB=7Km/h

T=[DISTANCE OF THE BANKS]/VB

T=1.5/7

T=0.214 hrs =12.85 min

is what i think

I am not sure with this sum

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