N E E E N E S E W N W S W W W W W S S N N N N E N N W N E N N W E S S W S E E E E E S N N N N E E S E N E W S W S W 720 (The final question is randomised, but in this case was 45 litres divided by 1/16, or to put it another way 45 x 16 = 720).