# Posts by Babiinoob

Total # Posts: 5

**Maths**

A river flows at 3km/h. At what speed must a boat travel in order to make a 35km trip upstream in a time of 50 minutes? How long will it take the boat to make the return trip downstream? (Assume the boat retains the speed travelled upstream) Working out please

**Maths**

An industrial fertiliser, costing $370 per tonne to produce, is sold retail at 61 cents per kilogram. If there is a wastage of 2.5%, find the profit as a percentage of the cost Working Ou Please Thanks

**Maths (Recurring Decimals)**

Express 3.2304 (dot above 2 and 4) as a fraction Please show working out too

**Maths**

The first year after 1999 which is the product of three consecutive integers is: 2004 2040 2046 2052 2184 Please show working out and choose either one of these years

**Chemistry**

Find the mass of oxygen gas needed to react with 0.2 moles magnesium and the mass of the product? Working out please