Question
A lorry and a Porsche were travelling from Town L to Town M which were 855 km apart. The Porsche set off 323 h later than the lorry but arrived 213 h earlier. If the average speed of the lorry was 57 km/h, find the average speed of the Porsche.
2 m

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A lorry and a Porsche were travelling from Town L to Town M which were 855 km apart. The Porsche set off 323 h later than the lorry but arrived 213 h earlier. If the average speed of the lorry was 57 km/h, find the average speed of the Porsche.