First we will calculate rate of work of rosa and amy.
work done by rosa in time t=t*1/7
Work done by Amy and rosa=t(1/7+1/4.2)
t/7+t/a=t/4.2
t=10.5 hr
Always keep remember those formula or logic belowWork rate × Time to finish the job = 1 job done
Work rate = (1 job done) / (Time to finish the job)
Time of doing the job = (1 job done) / (Work rate)
Do you have the answers like A,B,C,D?
Answer: -1
Step-by-step explanation:
i really don't know but i was taking a test and i guessed it and it was right
Answer:
Fourth and fifth ones are right
Step-by-step explanation:
Answer
The Answer is A C D
Step-by-step explanation: