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 t8 :64pur hzkpcriathlosqje 83s 70mrzb k9-v p(t0pean and cycles at a speed of 20 km/hr for 15 minutes followed by t hours running at a s9 0asm0jt-zb 3pp7e(v rk eqs8peed 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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