14.50 times 0.20 = 2.9
He would give a $2.90 as a tip of 20% from a bill of $14.50
Rate = 2 seats/11 minutes = 2/11 seats/min
Therefore the time required for s seats is

That is,
m = (11s)/2 min
When s = 16, obtain

When s = 19, obtain

Answers:

When s = 16, m = 88 min
When s = 19, m = 104.5 min
-13+21=14
The temperature is 14 degrees during your afternoon.