Applications of Maximisation and Minimisation (1 Viewer)

[Chris100]

A man in a rowing boat is presently 6km from the nearest point A on the shore. He wants to reach as soon as possible a point B that is a further 20km down the shore from A. If he can row at 8km/hr and run at 10km/hr, how far from A should he land?

 

[cineti970128]

8km

 

[cineti970128]

If you want to know how I got this answer, http://community.boredofstudies.org/13/mathematics-extension-1/max-min-question-316578.html

 

[Chris100]

I can't see the Pythagoras thereom in the question
Also Ty for reply

 

[enigma_1]

Wait I think I wrote the working somewhere lemme find it

 

[enigma_1]

Ok found it, one sec - the solution from that above linik is a different question

 

[enigma_1]

This is the solution - sorry for the messy working
ahhh I swear I changed it from sidewaysss