exam Maths Puzzle Numerical Ability

A boat travels at a rate of 15 kilometers per hour in still water. It travels 60 kilometers upstream in the same time that it travels 90 kilometers downstream. What is the rate of

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A can of Blue Runner Red Kidney Beans has surface area 371 cm squared. Its height is 12 cm. What is the radius of the circular top? Round to the nearest hundredth. Derive the solution P(t)=MP0/P0+(M-P0)e power (-kMt) of the logistic initial value problem P'=kP(P-M), P(0)=P0. Make it clear how your derivation depends on wherher 0<P0<M or P0>M