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?
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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
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