Question

Electrician A takes 15 minutes to fit a ceiling fan while electrician B takes 18 minutes to do the same job. Working together how long will they take to fit 22 ceiling fans

Answer 1

Answer:

A=15 minute

so, work in one minute=1/15 work

B=18 minute

so work in one minute done by  B=1/18

suppose both A and B will take the time= x minute

according to the question......

((1/18)+(1/15))*x=1 work........................(it means complete work)

(11/90)*x=1

x=1*(90/11)

x=8.18 minute approximately in one ceiling

so the time taken by both electrician to fit 22 ceiling fan =22*(90/11)=2*90=180 minute or 3 hour

Step-by-step explanation: