Schneider Wood
09/15/2023 · High School
A car completes a 200 km journey at an average speed of \( x \mathrm{~km} / \mathrm{h} \). The car completes the return journey of 200 km at an average speed of \( (x+10) \mathrm{km} / \mathrm{h} \). i) Show that the difference between the time taken for each of the two journeys is \( \frac{2000}{x(x+10)} \) hours. ii) Find the difference between the time taken for each of the two journeys when \( x=80 \). Give your answer in minutes and seconds.
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i) The difference in time is \( \frac{2000}{x(x+10)} \) hours.
ii) When \( x = 80 \), the difference is approximately 16 minutes and 40 seconds.
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