Trick question or easy question,have a look?

Question by Federer: Trick question or easy question,have a look?
Frieda begins speed training by running 5 kilometres every day. The time (in minutes) it takes for her to finish a 5 kilometre run is modeled by the following function:

R(t) = (50 + 19 t) ÷ (t + 1);

where t represents how long (in days) she has been training. The function is defined on the domain (0, ∞).

(a) How long did she take to run 5 kilometres on her first day (i.e., when t = 1)?

(b) How long did she take to run 5 kilometres on her fifth attempt?

(c) Find lim t→∞ R(t), and give a sensible interpretation of your answer in terms of the context given.

Please Help me answer this question. Please show working as just the answer will not help me understand.
Use any signs u want to help make answer clear { } ∩ U ] [ | ≤ ≥ ∞ Є ÷ ○ →

Is the 1st question answer 34.5? i.e by putting t=1. some people put t=5. dunno why that is.
2nd question 24.2??
3rd question 19mins???

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