Jones and Merle travel 250km to Johannesburg com Soweto Marathon fun run. Excluding any stops their driving time
is two and a half hours. Calculate their average speed.​

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.