A luxury coach leaves Bulawayo for Harare every morning at $7.30 \mathrm{am}$ and arrives in Harare at $1.00 \mathrm{pm}$.

(a) Express the departure time as a time in the 24 hour notation.

(b) Calculate the total time taken to travel from Bulawayo to Harare.

(c) Calculate the average speed of the bus to the nearest whole number if the distance from Bulawayo to Harare is $439 \mathrm{~km}$.