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Question:

A truck travelling at 70 kilometres per hour uses 30% more diesel to travel a certain distance than it does when it travels at the speed of 50 kilometres per hour. If the truck can travel 19.5 kilometres on a litre of diesel at 50 kilometres per hour, how far can the truck travel on 10 litres of diesel at a speed of 70 kilometres per hour?

Explanation:

Given, that the truck can travel 19.5 kilometres on a litre of diesel at 50 kilometres per hour.
∴ At 50 km/hr, truck covers 19.5 km in 1 litre diesel.

∴ The truck will use 30% more diesel i.e., 1.3 litre diesel to cover 19.5 km at 70 km/hr.

∴ At 70 km/hr, in 10 litres of diesel, the truck will cover 19.5/1.3 × 10 = 150 km

Hence, option (c).

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Doubts

Asif said (2023-08-24 07:51:00)

How there is 1.3 litre of diesel

Reply from Admin:

It is mentioned in the question that the truck can travel 19.5 kilometres on a litre of diesel at 50 kilometres per hour. Also, the truck uses 30% more diesel to travel same distance at 70 kmph. Hence it will use 1.3 liters diesel to travel same 19.5 kms at 70 kmph.

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