Question

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?​

Answer 1

Answer:

9 3/4 hours

Step-by-step explanation:

P,Q and R can finish a task in 8, 10 and 12 hours respectively.

LCM of 8,10,12 is 120

They started working together but after 3 hours, P and R left

they worked for 3 hrs =3/120=1/40

remaining work 1-1/40=39/40

39/40 has to done by Q in how many hours

(39/40)*10=39/4

=9  3/4 hrs