logic puzzle

[bobobalde111]

its exactly half past 12 time for lunch jane declared . but look at the old electric clock. its running backwards and showing 24 minutes past six.

i know ron told her it does that sometimes if the power has been cut off .and the lights did go off at six minutes past nine today

how long had the power been off that day

[juliefer]

42 minutes. It went off 3 hours and 24 minutes ago (12.30 less 9.06) and it came back on 2 hours and 42 minutes ago (6.24 away from 9.06) so the difference is 42 minutes.