A 45000litre water tank is to be filled at a rate of 220litres per minute,estimate to the nearest half hour,how long it will take to fill the tank?
A
4
B
3.5
C
3
D
2.5
Correct Answer: 3.5
Time needed = 45000 / 220 min = 204.5 min ≈ 3.5 hour