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Posted by on Sunday, April 7, 2013 at 3:47pm.

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.

  • Math - , Sunday, April 7, 2013 at 6:47pm

    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.

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