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Mensa Prize Puzzle Competition - May 2020

Question: 

During lockdown a boy is using an exercise bike to get fit.

For the first 15 days he only manages an average of 2 minutes cycling per day..

After a further 20 days of lockdown, his average over the entire time has risen to 9 minutes per day.

How many minutes and seconds has the boy averaged over the last 20 days only?

Answer: 

14 minutes and 15 seconds.

Closing Date: 
Sunday, May 31, 2020
Show Answer On: 
Monday, June 1, 2020