Answer:
First question : 61 miles per hour
Second question : 21 miles per hour
Explanation:
Since,

First question :
Distance = 244 miles,
Time = 4 hours,
So speed =
= 61 miles per hour,
Second question :
Distance = 15 miles,
Time = 43 minutes =
hours ( ∵ 1 hour = 60 minutes )
So, speed =
=
= 20.930232 ≈ 21 miles per hour