A tri-athlete dives from a bridge into a river and swims upstream through the water at the same rate of speed. As the swimmer passes under the bridge, a bystander tells her that her hat fell into the river when she originally dived in. The swimmer continues downstream at the same rate of speed, catching up with the hat at another bridge exactly 1 mile downstream from the first one. What is the speed of the current in miles per hour?

Question

A tri-athlete dives from a bridge into a river and swims upstream through the water at the same rate of speed. As the swimmer passes under the bridge, a bystander tells her that her hat fell into the river when she originally dived in. The swimmer continues downstream at the same rate of speed, catching up with the hat at another bridge exactly 1 mile downstream from the first one.  What is the speed of the current in miles per hour?