Question

Rahul finished colouring a picture in 7 upon 12 hour vaibhav finished colouring the same picture in 3 upon 4 hour who worked longer? by what fraction

Answer 1

$\frac{7}{12} = 0.583$
$\frac{3}{4} = 0.75$
Therefore, Vaibhav worked longer by...

$\frac{3}{4} - \frac{7}{12} \\ = \frac{3 \times 3}{4 \times 3} - \frac{7}{12} \\ = \frac{9}{12} - \frac{7}{12} \\ = \frac{2}{12}$