Sorry ...here's another differentiation problem i can't solve ><" ...i asked my friends but they have no clue and since it's the holz my teacher is inaccessible
Although an example in the textbook showed a similar question, i can't seem to get the answer with the method shown.
Problem: A man in a boat is 4 km from the nearest point O of a straight beach; his destination is 4 km along the beach from O. If he can row at 4 m/h and walk at 5 km/h, how should he proceed in order toreach his destination in the least possible time?
The textbook answer is: Row direct to destination.
Here's my solution:
Time to travel BC
Time to travel CD
Total time T
For least possible time,
When I work out x, it equals approx. 0.06...which does not make sense at all.