plz answer this unitary method question step by step??
Share
plz answer this unitary method question step by step??
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
B one minute work=1/20
C one minute work=1/30
all together=1/15+1/20+1/30=3/20
all together work for 2 minute=3×2/20=3/10
remaining work=1-(3/10)=7/10
B and C work together for 4 minutes=(1/20+1/30)×4=1/3
remaining work=7/10-1/3=(21-10)/30=11/30
c does remaining work=11/30×30=11 minute