The above diagram represents a trough which is 6 metres long and whose cross-section is a semicircle of diameter 1.4 metres. a) Calculate i. the cross-sectional area of the trough in #cm^2#. ii. the capacity of the trough in litres b) The trough which is initially empty is filled by a diesel pump which pumps water at the rate of 1.54 litres per second. Calculate the time in minutes it takes to fill the trough. c) Diesel costs sh 44.80 per litre and the pump consumes it at the rate of 6 litres per hour. Calculate the cost of diesel required for the pump to fill the trough.