posted by Maggie .
Kiran drove from City A to City B, a distance of 242 mi. She increased her speed by 10 mi/h for the 351-mi trip from City B to City C. If the total trip took 12 h, what was her speed from City A to City B?
since time = distance/speed, If she started out with speed x, then
242/x + 351/(x+10) = 12