180 min
Explanation:
3 × 10 min = 30 min
In 6 hours, Mr. White takes a total of 30 min in breaks.
36 h = 6 h × 6
In 36 hours , there are 6 sets of 6 h .
Hence we can multiply the number of minutes in breaks taken in
6 h ours by 6 to obtain the number of minutes in breaks taken in 36 h ours.
30 min × 6 = 180 min