本题目来源于试卷: IB MAI HL Functions Topic 2.3 Properties of Functions，类别为 IB数学
[问答题]
Emily is training for a triatqix 8 nxud(v o1h.,z.zukmjszl) (9typ2gp2.hlon and c5 iz/tfw1m0bf pe0dp -ycles at a speed of 20 km/hr for 15 minutes fopt0i5pb1mweff 0-/d zllowed by t hours running at a speed of 15 km/hr.
1.Show that a function to model her average speed S(t) is given by
S(t)= $\frac{20+60t}{1+4t}$.
2.Find $S^{−1}(t)$.
3.Hence find the time, t, if the average speed Emily travels at is 16 km/hr.
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