Michael finished colouring a picture in `7/12` hour. Vaibhav finished colouring the same picture in `3/4` hour. Who worked longer ? By what fraction was it longer ?

Michael finished colouring a picture in 7/12 hour. Vaibhav finished coluring the same picture in 3/4 hour. Who worked longer? By what fraction was it longer?

Michacl finished colouring a picture in frac{7}{12} hour. Vaibhav finished colouring the same picture in frac{3}{4} hour. Who worked longer? By what fraction was in longer?

A can finish a piece of work in 12 hours while B can finish it in 15 hours. How long will both take to finish it, working together?

Rafiq exercised for (2)/(3) hour, while Rohit exarcised for (3)/(4) hour. Who exercised for a longer time?

Sita can finish typing a 100 page document in 9 hours, Mita in 6 hours and Rita in 12 hours. How long will they take to type a 100 page document if they work together?

Sita can finish typing a 100 page document in 9 hours, Mita in 6 hours and Rita in 12 hours. How long will they take to type a 100 page document if they work together?