Here's the question you clicked on:
marissamtz
A river flows due south at 1.2 mi/h. In what direction should the swimmer head, at a velocity of 2 mi/h, in order to arrive at a landing point due east of his starting point? (Round your answer to one decimal place.) in degrees
you can simply do it by finding the resultant that is 2.56
and now u can use tan for speed of river by resultant
and i think the answer is 51.3 E
|dw:1385904335765:dw| this diagram may help...
Refer to the attachment from Mathematica.