Solving rational equations

Question

Sumi can wash the windows of an building 3/4 the time it takes her apprentice. One day they worked on a building together for 2 hours and 16 minutes, and then Sumi continued alone. It took 4 hours and 32 minutes to complete the job. How long would it take her apprentice to wash all the windows alone?

Answer 1

t represents the time needed for the apprentice

0.75t represents the time needed by Sumi

(2.267 / t) + (2.267 / 0.75t) = 1

Can you do the arithmetic and solvel for t and answer?