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A cycle race across America is 3609.25 miles in length - Edexcel - GCSE Maths - Question 4 - 2018 - Paper 1

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A cycle race across America is 3609.25 miles in length. Juan knows his average speed for his previous races is 15.12 miles per hour. For the next race across Ameri... show full transcript

Worked Solution & Example Answer:A cycle race across America is 3609.25 miles in length - Edexcel - GCSE Maths - Question 4 - 2018 - Paper 1

Step 1

(a) Estimate how many days Juan will take to complete the race.

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Answer

To estimate how many days Juan will take to complete the race, first calculate the total hours required to complete the race using his initial speed.

  1. First, calculate the total time in hours:

    extTotalTime(hours)=Total DistanceSpeed=3609.25 miles15.12 miles/hour ext{Total Time (hours)} = \frac{\text{Total Distance}}{\text{Speed}} = \frac{3609.25 \text{ miles}}{15.12 \text{ miles/hour}}

    Performing the calculation gives:

    Total Time (hours)238.35 hours\text{Total Time (hours)} \approx 238.35 \text{ hours}

  2. Next, calculate the number of days by determining how many hours Juan cycles per day:

    Days=Total TimeHours per Day=238.35 hours8 hours/day\text{Days} = \frac{\text{Total Time}}{\text{Hours per Day}} = \frac{238.35 \text{ hours}}{8 \text{ hours/day}}

    This results in:

    Days29.79\text{Days} \approx 29.79

    Rounding up, Juan will take approximately 30 days to complete the race.

Step 2

(b) How does this affect your answer to part (a)?

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Answer

With the increased speed of 16.27 miles per hour, we can repeat the calculation:

  1. Calculate the new total time in hours:

    Total Time (hours)=3609.25 miles16.27 miles/hour\text{Total Time (hours)} = \frac{3609.25 \text{ miles}}{16.27 \text{ miles/hour}}

    Performing this calculation leads to:

    Total Time (hours)221.01 hours\text{Total Time (hours)} \approx 221.01 \text{ hours}

  2. Calculate the number of days:

    Days=221.01 hours8 hours/day\text{Days} = \frac{221.01 \text{ hours}}{8 \text{ hours/day}}

    This results in:

    Days27.63\text{Days} \approx 27.63

    Rounding up, Juan will now take approximately 28 days to complete the race.

Therefore, the increased speed decreases the completion time from approximately 30 days to 28 days.

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