The line graph below shows the average waiting time from 2008 to 2012 for the patients at the emergency department of a hospital.

(a) What was the difference between the longest waiting time and the shortest waiting time during the period from 2008 to 2012?

(b) Find the percentage increase in waiting time for a patient between 2009 and 2010. Give your answer correct to 1 decimal place.

(a) 35min

(b) 38%

(b) 38%

(a) 36min

(b) 38.5%

(b) 38.5%

(a) 37min

(b) 39%

(b) 39%

(a) 38min

(b) 39.5%

(b) 39.5%

None of the above