ruby on rails - can real time in benchmark.rb be less than the other other ones? -

this benchmark.rb output. not weird real time less ther system , total time? or okay have it? new ruby, please forgive me if sound stupid. thanks!

user     system      total     real 1.050000   0.000000   1.050000 (0.503462) 1.533333   0.016667   1.550000 (0.735473) 1.500000   0.016667   1.516667 (0.711239)    

my guess ran on dual core machine, or @ least multiple core, , ran 2 threads.