Since you know the average speed is 50km/h, this means that:
if the car travels for 60 minutes, then it travels 50km. We can write this as 60n=50km
then we solve for n, which is 5/6.
Next, we want to find the blank for: if the car travels for x minutes, then it travels 17km. so we can write that as x(5/6)=17km. x=17/(5/6). x=20.4.
Therefore, it takes 20.4 minutes to travel 17km.
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