Question 620386: Hi i am really struggling to know how to answer one of my questions, in my SAC booklet for methods.
can you please help me solve this.
Q. a man in a boat, point B is 3 kilometres from the nearest point O of a straight beach. his destination, point D is 6 km's along the beach from O. he can row at 4km/h & walk at 5km/h
O ● ____________●C__________●D
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B●
(there is a line from point B, to C which extends to point D. i just couldn't draw the triangle
He decided to row to a point C, which is (x)km, along the beach from point O. and then walk from point C to his destination D. Find a general equation for the time, T, of this journey in terms of x.
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! Hi i am really struggling to know how to answer one of my questions, in my SAC booklet for methods.
can you please help me solve this.
Q. a man in a boat, point B is 3 kilometres from the nearest point O of a straight beach. his destination, point D is 6 km's along the beach from O. he can row at 4km/h & walk at 5km/h
O ● ____________●C__________●D
|
|
|
|
|
|
|
|
|
|
B●
(there is a line from point B, to C which extends to point D. i just couldn't draw the triangle
He decided to row to a point C, which is (x)km, along the beach from point O. and then walk from point C to his destination D. Find a general equation for the time, T, of this journey in terms of x.
:
The distance rowed is the hypotenuse of a right triangle with legs of 3 & x
the distance from C to D = (6-x)
Time = dist/speed
:
time = time rowing + time walking
f(x) =  + 
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