Question

P P,Q and R can finish a task in 8, 10 and 12 hours respectivly.They started working together but after 3 hours, P and R left. How long will Q take to finish the task now?​

Detail it

Answer 1

45 minutes

Explanation:

Assume task completed in total x hours

`(x)/(10) + (3)/(8) + (3)/(12) = 1 \\ 12x + 45 + 30 = 120 \\ 12x = 45 \\ x = (15)/(4) = 3 (3)/(4)`

So q will take 45 more minutes