A boat on the ocean is 4 mi from the nearest point on a straight shoreline; that point is 6 mi from a restuarant on the shore. A woman plans to row the boat straight to a point on the shore amd then walk on the shore to the restaurant.

a. if she walks 3mi/hr and rows at 2mi/hr at which point on the shore shold she land to minimize the total travel time?

b. if she walks 3mi/hr what is the minimum speed at whcih she must row so that the quickest way to the resturant is to row directly (with no walking)