Answer:
First case
0.3m = r
0.3m = 18
m = 18/0.3
m = 60 mins.
Second case
0.3 x 180 = r
r = 54 rows
Third case
0.3m = 72
m = 240 minutes
Fourth case
0.3 x 360 = r
r = 108 rows
Hope this helps!
