A car travels 6.0km along a main road in 6.0 minutes. It then travels 2.0km along a minor road in 6.0 minutes.
Which calculation of average speed for the whole journey is correct?

8.0 ÷ 12.0 = 0.67 km/ minute
2 )
12.0 ÷ 8.0 = 1.5km/ minute
3 )
8.0 + 12.0 = 20km/ minute
4 )
8.0 × 12.0 = 96 km/ minute
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