Question

Terrell has a water purifier for back packing. it will purify 1 liter of water in 1 minute. how long would it take Terrell to purify enough water for 4 canteens that each hold 750 mL,and two that each hold 1.5 L ?

Answer 1

750 + 750 = 1,500 mL
1.5 + 1.5 = 3 L
1,500 mL = 1.5 L
3 + 1.5 = 4.5 L total

To fill all four of the canteens, it will take 4.5 minutes.