h Answer: _________

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October 2022 1 8 Report

A car travels 40 kilometers at an average speed of 80 km/h and then travels 40 kilometers at an average speed of 40 km/h. The average speed of the car for this 80- km trip is:

A) 40 km/h B) 45 km/h C) 48 km/h D) 53 km/h

Answer: __________

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tmpascual

Answer:

Explanation:

Time taken (t) = distance travelled ÷ average speed

$t_{1}$ (time taken in the first 40 km) = $(\frac{40}{80}) = 0.5$ hr

$t_{2}$ (time taken in the second 40 km) = $(\frac{40}{40}) = 1$ hr

Total time for the 80-km trip = $t_{1} + t_{2}$ = $0.5 + 1 = 1.5$ hrs

Average speed = total distance travelled ÷ total time

Average speed = $(\frac{80}{1.5}) = 53.33$ km/h

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