Answer:
Bess has been keeping track of the storm for 14 hours.
Step-by-step explanation:
The tropical storm has been moving at 15 miles per hour.
Bess recorded that the storm moved 135 miles yesterday and 75 miles today. Total distance covered by storm is
[tex]135+75=210[/tex]
The relationship between distance speed and time is defined as
[tex]speed=\frac{distance}{time}[/tex]
[tex]15=\frac{210}{time}[/tex]
[tex]time=\frac{210}{15}[/tex]
[tex]time=14[/tex]
Therefore, Bess has been keeping track of the storm for 14 hours.