a lorry travelled 84 km between two towns the first 60 km of road was...
a lorry travelled 84 km between two towns the first 60 km of road was...
a lorry travelled 84 km between two towns the first 60 km of road was untarred and the average speed over this part was 30 km/h. if the average speed for the whole journey was 36 km/h, calculate the average speed over the good part of the road?
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