Question

Caitlin lives in Wollongong and travels to Sydney daily.

The car trip requires her to travel at different speeds. Most often she travels 30 kilometres at 60 km/h and 40 kilometres at 100 km/h.


What is her average speed (in km/h) when traveling to Sydney? (Answer correct to two decimal places.)​

Answer 1

Average Speed ≅ 82.86 km/h

Explanation:

Total distance of the trip is 30 + 40 (kilometres) = 70km

Total speed covered in each trip will be (30km * 60km/h) + (40km * 100km/h) = 5800km²/h

Therefore Average Speed =
`\\(Total speed covered in each trip)/(Total distance of the trip)`

=
`(5800kM^(2) /H)/(70kM)` = 82.8571 to 2 decimal places

≅ 82.86 km/h