GCSE Secondary Maths Age 13-17 - Ratio, Proportion & Rates of Change: Gallons and Litres - Explained

The video tutorial explains how to convert a flow rate from gallons per minute to liters per second. It starts by converting 20 gallons to liters, resulting in 91 liters per minute. Then, it calculates the flow rate in liters per second by dividing by 60, yielding 1.516666667 liters per second. The final answer is rounded to three significant figures, resulting in 1.52 liters per second. The tutorial also explains the marking scheme, with one mark for the final answer and another for recognizing the conversion of 91 liters per minute.

What is the conversion factor from gallons to litres?

• 1 gallon = 5.00 litres

• 1 gallon = 4.55 litres

• 1 gallon = 4.00 litres

• 1 gallon = 3.78 litres

How many litres are equivalent to 20 gallons?

• 85 litres

• 90 litres

• 95 litres

• 91 litres

What is the rate of water flow in litres per minute?

• 95 litres per minute

• 91 litres per minute

• 90 litres per minute

• 85 litres per minute

How do you convert litres per minute to litres per second?

• Divide by 1000

• Multiply by 1000

• Multiply by 60

• Divide by 60

What is the final answer for the flow rate in litres per second, rounded to three significant figures?

• 1.53 litres per second

• 1.52 litres per second

• 1.51 litres per second

• 1.50 litres per second