Question
A car travelled 12 of its journey at an average speed of 102 km/h. Find its average speed for the remaining 408 km if its average speed for the whole journey was 68 km/h.
2 m

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A car travelled 12 of its journey at an average speed of 102 km/h. Find its average speed for the remaining 408 km if its average speed for the whole journey was 68 km/h.