port A is 80 km due north of port B. the sailing time from A to B is 5 hours. if the velocity of the current west is 12 km hr^-1 find the velocity with which the ferry should head in order to complete the journey in the scheduled time

i have came up with only 1 equation. 80/vcosa =5 im now trying to find another equation with the current velocity in it and solve these 2 equations