(a(i))[2]
Calculate $h$.
(a(ii))[3]
Fuel is pumped into the empty tank at a rate of $0.2\,\text{m}^3$ per minute. Calculate the time taken to fill the tank to $90\%$ of its volume. Give your answer in minutes and seconds.
(b)[5]
The diagram shows an open-topped tank. The tank is a prism with trapezium $ABCD$ as its cross-section. $AD = BC = 70\,\text{cm}$, $CD = 80\,\text{cm}$ and $AB = 110\,\text{cm}$. The base of the tank is a square. Calculate the total surface area of the outside of the tank.