IB MAI HL Functions Topic 2.3 Properties of Functions (id: 44f1bbc5b)

本题目来源于试卷: IB MAI HL Functions Topic 2.3 Properties of Functions，类别为 IB数学

[填空题]
James goes on a cross-countryf mgp:36zi x7y73nahzgvwq 4c6 m:;wc bike ride which comprises of 8 km of flat terrain followed by 12 km of constant uphill sloping terrain. We know James can cycle at gh4qcw ;ncv6 am 3wz:7a speed of 24 km/hr in flat terrain, however we don't know his speed on sloping uphill terrain, and therefore denote this by x km/hr.
1.Show his average speed over the entire ride, in terms of x, can be expressed as
S(x)=​​$\frac{60x}{x+36}$
2.Find $S^{-1}$(x).
3.Hence find the speed he needs cycle over the sloping uphill terrain in order to obtain an average speed of 20 km/hr for the whole ride.    km/h

参考答案: 18


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