To find out how many litres of petrol the car will use in 1 hour, we can use the following proportion:
15 litres of petrol is used in 45 minutes
x litres of petrol is used in 1 hour
Cross multiply to solve for x:
15 * 60 (to convert 45 minutes to 1 hour) = 45 * x
900 = 45x
x = 900 / 45
x = 20
Therefore, the car will use 20 litres of petrol in 1 hour.
A car uses 15 litres of petrol in 45 minutes. How many will it use in 1 hour
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