Speed, Distance & Time: Hard Test 5

15 questions · 15 minutes

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A competitor walks 3 km at 6 km/h and then runs 3 km at 12 km/h. What is the average speed for the whole 6 km?
A speed of 90 km/h is the same as which speed in metres per second?
A train travels 150 km at 75 km/h, waits at a station for 25 minutes, then travels 90 km at 60 km/h. How long is the whole journey?
A car covers the first 120 km of a 360 km journey at 60 km/h and the remaining 240 km at 80 km/h. What is its average speed for the whole journey?
Two cars leave the same place at the same time and drive in opposite directions at 55 km/h and 65 km/h. After how long are they 300 km apart?

Average speed is total distance divided by total time - not the average of the individual speeds, which is a favourite trap.
On a distance-time graph, a steeper line means faster, and a flat line means stopped.