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a person can swim instillwater at 5kmph.he aims on one bank of river at an angle of 30 0 with normal to the flow to reach opposite point of start in 1/√3hr the width of the river is--km

a person can swim instillwater at 5kmph.he aims on one bank of river at an angle of 300with normal to the flow to reach opposite point of start in 1/√3hr the width of the river is--km


 

Grade:Upto college level

1 Answers

Badiuddin askIITians.ismu Expert
148 Points
14 years ago

Dear G Somaiah


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he reaches at the apposite end  of the rever then his horizontal component of speed must be equal to the velocty of the river

  vertical componen of velocit =5cos30 = 5√3 /2 km/h

 now time teken to cross the river = 1/√3  hr

so 1/√3 = d /5√3 /2

   d=5/2 km

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