modify Utils.minutes_in_an_hour method
modify Utils.minutes_in_an_hour method

before:
minutes_in_a_day = num_minutes % (24 * 60)
minutes_in_a_day % 60

after:
num_minutes % 60

before and after is equivalent functionally.
Thus, remove the meaningless part of before.
cloudfoundry-incubator/admin-ui,cloudfoundry-incubator/admin-ui,cloudfoundry-incubator/admin-ui