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Q7. The speed of a ship is reduced by 20% when 600 nautical miles from port, thereby reducing the daily fuel consumption by 42 tonne. The ship arrives in port with 60 tonne of fuel on board. The fuel consumption in tonne per hour is given by the expression:

C = 0.14 + 0.001 v³

where v is the speed in knots.  Calculate EACH of the following:

(a) The reduced daily fuel consumption; (6)

(b) The amount of fuel on board when the speed was reduced; (4)

(c) The percentage decrease in fuel consumption for the reduced speed part of the voyage; (4)

(d) The percentage increase in time for this latter part of the voyage. (2)