Question
A lorry and a Mercedes started travelling from Town Q to Town R at the same time. After 5 hours, the Mercedes reached Town R while the lorry covered only 79 of the journey. The speed of the Mercedes was 20 km/h more than the speed of the lorry. Find the speed of the lorry.
3 m

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A lorry and a Mercedes started travelling from Town Q to Town R at the same time. After 5 hours, the Mercedes reached Town R while the lorry covered only 79 of the journey. The speed of the Mercedes was 20 km/h more than the speed of the lorry. Find the speed of the lorry.