From a 200-ton pile of coal, a conveyor belt removes 1
1
ton per minute. By lunchtime, only of a ton was left
3
6
on the pile. Which equation can be used to find x, the
number of minutes the conveyor belt was used to remove
coal before lunch?
А
1
Х
6
B
1
= 200
3
1 1
X=
3 6
1 1
X+ - = 200
6 3
1 1
200+
6
200
D