The radio signal from the transmitter site of the radio station WGGW can be received only within a radius of 52 miles in all directions from the transmitter site. A map of the region of coverage of the the radio signal is given in the standard (x,y) coordinate plane, with the transmitter site at the origin and 1 coordinate unit representing 1 miles.
The transmitter site of radio station WGGW and the transmitter site of another radio station, WGWB are on the same highway 100 miles apart. The radio signal from the transmitter site of WGWB can be received only within a radius of 60 miles in all directions from the WGWB transmitter site. Assuming the highway is a straight, for how many miles along the highway can the radio signals of both stations be received?
The solution is 12 but I don't have a clue how they got that as the answer??