simple puzzle

im at work and my mind gone completely blank, iv done this so many times at school/college but my head is bangin!

if the below are times in minutes, what is the total seconds…i want da answer in formula form cuz every1 can add (even me!)

0.40
0.50
1.22
1.43

Re: simple puzzle

i need da answer in 12 mins!

Re: simple puzzle

wait for 275 seconds and u might get the answer.

Re: simple puzzle

or may be in 216 seconds