A speed of 60 km/hour for the nest 30 km and at a speed of 30 km/hour for the last 10 km?

A bike consumes 20 mL of petrol per kilometre, if it driven at a speed in the range of 25-50 km/hour and consumes 40 mL of petrol per kilometre at any other speed. How much petrol is consumed by the bile in travelling a distance of 50 km, if the bike for the first 10 km, at a speed of 60 km/hour for the nest 30 km and at a speed of 30 km/hour for the last 10 km?
(a) 1 L
(b) 1.2 L
(c) 1.4 L
(d) 1.6 L

Anurag Mishra Professor Asked on 19th February 2016 in Maths.
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    Answer: (b) 1.2 L

    Anurag Mishra Professor Answered on 19th February 2016.
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