The resultant velocity of the plane is the sum of the two velocity vectors which are perpendicular to each other. See the attached figure.
The magnitude of the resultant velocity is
.
The approximate value of the actual velocity of the plane is
. Correct choice is (D).
The answer to that would be 1.04166667.
Myra swims 3/5 of mile so that is .6 miles
0.06x=0.045(65100-x)+231
Solve for x
X=30100
Find the amount of interest in each account
0.06(30100)=1806 first account
0.045(65100-30100)=1575 sec account
Total interest=1,806+1,575=3,381