Answers

2014-02-13T22:29:14+01:00
1 h=60 mins
2 h=60x2=120 min
1/2 h=30min

therefore 2 1/2 h=120+30 
                        =150mins

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2014-02-14T17:40:01+01:00
21/2 hours = 21/2 X 60
An easy way to the this is to convert 21/2 to decimal which is 10.5 , then multiply
10.5 X 60 = 630.0 which is 630
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