Question

sali drives her car .she drives the first 17miles in 17 minutes. she then drives af an average speed of 64mph for 1hour 48minutes.

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Answer 1

Step-by-step explanation:

17 ...

18-Oct-2020 — Sali drives her car .she drives the first 17miles in 17 minutes. she then drives af an average speed of 64mph for 1hour 48minutes. - 26111451.

Answer 2

Answer:

3.22 gallons

Step-by-step explanation:

There is some information missing from this question so I'm going to assume it's the same as the question on mathswatch.

First we want to find the speed of the first 17 miles. As she travels 1 mile every minute, she must travel at 60mph as 1 x 60 = 60.

We now want to find the distance of the second part of the journey:

As distance = speed x time, you would convert 1hr 48 minutes into a decimal number. 60/48 = 0.8. Therefore 1hr 48 minutes = 1.8 hrs. The distance is 64 (speed) x 1.8 (time) = 115.2 miles.

So the important information that we will need to use is:

- that the first part of the journey is 60mph and 17 miles

- the second part of the journey is 64mph and 115.2 miles.

We now know both the speed and distance of the first part of the journey. The table says that for speeds under 62mph, 50 miles are travelled per gallon of petrol used. To find the amount of petrol used, we divide the distance by 50:

17/50 = 0.34 gallons of petrol for the first part of the journey.

Now for the second part of the journey:

We know from the question that the speed of the second part of the journey is 64mph, which is over 62mph. This means that there is 40 miles per gallon of petrol used. Therefore, to find the amount of petrol used, you would divide the distance by 40:

115.2/40 = 2.88 gallons for the second part of the journey.

Now we simply add up the totals for the first and second parts of the journey:

0.34 + 2.88 = 3.22 gallons altogether