a) \(\displaystyle {1 \over 6}\) giờ \(=\displaystyle {1 \over 6}.60 = 10\) (phút)
b) \(\displaystyle {1 \over 3}\) giờ \(= \displaystyle {1 \over 3}.60 = 20\) (phút)
c) \(\displaystyle {3 \over 4}\) giờ \(= \displaystyle {3 \over 4}.60 = 45\) (phút)
d) \(\displaystyle {2 \over 5}\) giờ \(= \displaystyle {2 \over 5}.60 = 24\) (phút)
e) \(\displaystyle {7 \over {12}}\) giờ \(= \displaystyle {7 \over {12}}.60 = 35\) (phút)
g) \(\displaystyle {4 \over {15}}\) giờ \(= \displaystyle {4 \over {15}}.60 = 16\) (phút)
