# 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