I don't know how to do question 5 and 8 290UNIT 2 Mathematics Methods5.3)At 1 pm on a hot day the rate, in cm per minute, at which water in a swimming pool evaporates isdVgiven asdtwhere t is the number of minutesafter 1 pm.60%3D-10(a) At what time will evaporation stop on this particular day?dvdt=60-10(b) Find the total amount of water, in litres, that evaporates between 1 pm and by the timeevaporation stops. Crude oil flows in and out of a tank at a refinery on a particular day such that the rate of change of thevolume of crude oil, in litres, is given as -Chapter Nine Integratio8.on a particular day such that the rate of change of the(t+10)(t-70)(t-140)dtdVwhere t is the time, in minutes%3Dafter 6 am.(a) Determine the rate of change of volume of crude oil at 6 am.1000du(も+lo)(t70)(t-140)10002(b) Determine the minimum rate of change of volume of crude oil and at what time this occurs.At 6 am the tank held 1000 litres of crude oil.(c) Determine how much crude oil was in the tank at 7:30 am.

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5. At 1 pm on a hot day the rate, in cm per minute, at which water in a swimming pool evaporates is dV given as dt = 60 - where t is the number of minutesafter 1 pm, 10 (a) At what time will evaporation stop on this particular day? dt=60-To V:S+ bot +c. (b) Find the total amount of water, in litres, that evaporates between 1 pm and by the time evaporation stops.