Question

A small island is 5 miles from the nearest point p on the straight shoreline of a large lake. if a woman on the island can row a boat 2 miles per hour and can walk 3 miles per hour, where should the boat be landed in order to arrive at a town 7 miles down the shore from p in the least time

Answer 1

Time =5mile/hour/5mile=1 hour
then for 7 miles, the boat should be landed in the 4miles away from point p because of 7 -3 = 4 miles of being on a boat.