Question 951135
time*speed=distance
t=time in hrs., c=speed of the current in m/h.
t(27+c)=324
t(27-c)=162
.
27t+ct=324
27t-ct=162
------------add
54t====486
.
t=9 hrs
.
9*(27+c)=324
243+9c=324
9c=81
c=9 m/h
.
Ed