Answer:
50 mins
Step-by-step explanation:
Set up the following equation:
80-0.6m=100-1m
1) Add 1m to both sides:
80+0.4m=100
2) Subtract 80 from both sides:
0.4m=20
3) Divide both sides by 0.4:
m=50
Let me know if you have any difficulty understanding how I set up the equation!