0.4
62.4
0.6944
91
(312)/(2 and 1/2) = (312)/(5/2) = (312x2)/5 = 624/5 = 124 and 4/5 hours
0.016
0.016
0.4
Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "times", "divided by", "equals". The operator between 5 and 312 cannot be seen.
62.4
0.6944
0.0288
78 divided by 5 and how do you work it out = 15.6
5/8 *312 = 195.
307
91
0.016