Maggie and Aggie synchronize their watches, rehearse their plan one last time, and start driving their cars at exactly midnight. Maggie heads due east, and Aggie heads due north, traveling 15 mph faster than Maggie. At exactly 1:20 a.m. the two ladies are exactly 100 miles apart, as observed from an inconspicuous police glider piloted by Sulphronia the super agent, who is watching through infra-red binoculars. At what speeds are the two sisters driving?
