Can someone please help me out with this problem please

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.

Aboat has a speed of 9 mph in calm water. it takes the boat 4 hours to travel upstream but only 2 hours to travel the same distance downstream. which equation can be used to find c, the speed of the current? 2(9 – c) = 4(9 + c) 9 + c = 4(9 – c) 9 – c = 2(9 + c) 4(9 – c) = 2(9 + c)