posted by Andre
Kathy drove from Dry Creek to Cactus, a distance of 250km. She increased her speed by 10km/h for the 360km trip from Cactus to spur. If the total trip took 1 hours, what was her speed from Dry creek to Cactus.
Assuming Kathy is a Formula-1 racer, driving 510km in 1 hour,
time = distance/speed
add up the times:
250/x + 360/(x+10) = 1
x = 604.13 km/hr - a new world land speed record!!!!
If 1 hour is not the correct time, then fix it and solve the new equation.