Answer:
The percentage increase of Seraphina's speed=18.033%
Step-by-step explanation:
Step 1
Define the initial and final speeds as shown;
Initial speed=61 miles per hour
Final speeds=72 miles per hour
Step 1
Express the formula for calculating the percentage increase of Seraphina's speed as follows;
% increase={(F-I)/I}×100
where;
F=final speed
I=initial speed
In our case;
F=72 miles per hour
I=61 miles per hour
replacing;
% increase={(72-61)/61}×100
% increase=(11/61)×100=18.033%
The percentage increase of Seraphina's speed=18.033%
