Question

Optimization question
see pic attached

Answer 1

where is pic??????

Answer 2

D' is x/ 4 sqrt (16+x^2) - 1/10

Answer 3

let he walk runs x meters
but as he has to minimize time so he will swim right opposite direction so reach in opposite bank in fixed time ie 10/4=2.5sec speed of river must be given ffor complete solution:(

Answer 4

i dont think so..i'm on my last step already but just didn get that part

Answer 5

i got my answer as 8sqrt 21 / 21 ,, but it is not part of the options i can choose from

Answer 6

you r not getting if the river has 300m/s speed (assume) then the deer can not reach to it he has to run in negative direction:)