Please, I need help understanding how to solve part B (details below)A boat on the ocean is 3 mi from the nearest point on a straight shoreline; that point is 13 mi from a restaurant on the shore. A womanplans to row the boat straight to a point on the shore and then walk along the shore to the restaurant. Complete parts (a) and (b).a. If she walks at 3mi//hr and rows at 2mi//hr, at which point on the shore should she land to minimize the total travel time?To minimize the total travel time, the boat should land 13-(6)/(sqrt5) miles from the restaurant.(Type an exact answer, using radicals as needed.)b. If she walks at 3mi//hr, what is the minimum speed at which she must row so that the quickest way to the restaurant is to row directly (with no walking)?The minimum speed she must row is mi//hr.(Type an exact answer, using radicals as needed.)