The table shows the time taken by Flynn to run 100 metres during his training sessions. After 3 attempts, Flynn wanted to improve his average time taken by 0.9 seconds by running faster in the 4^th attempt. How fast should he run in the 4^th attempt in order for him to make the improvement?

Attempt	1st	2nd	3rd	4th
Time taken  (in seconds)	17	16	15	?

Total time that Flynn took for the first 3 attempts
= 17 + 16 + 15 
= 48 s

Average time that Flynn took for the first 3 attempts
= 48 ÷ 3
= 16 s

New average time that Flynn took for the 4 attempts
= 16 - 0.9
= 15.1 s

Total time that Flynn took for the 4 attempts
= 4 x 15.1
= 60.4 s

Time that Flynn should run in the 4^th attempt in order for him to make the improvement
= 60.4 - 48
= 12.4 s

Answer(s): 12.4 s