Answer to Question #47673 in Mechanics | Relativity for tinu

Question

to cross a river in the shortest time why the total distance crossed by the boat is more than the boat cross the river across to the shortest distance? to cross across to the shortest distance it takes more time than the time needed to cross the river in shortest time and this time the distance is more than the shortest distance. if we think generally to cross long distance it takes long time.but in this case why it is different ?