Answer:
all qn 1,2,3 have same answer ,. Yes,. hope it helps
River shore is located at distance

speed of the woman is given as

now the time taken by the woman to cover the distance is


for the same time interval the dog will run to and fro with speed 4.5 m/s
so the total distance moved by the dog is given by



<em>so the total distance that dog will move is 7200 m or 7.2 km</em>
Umm... I think I saw this question somewhere else answered.... You should look for it.