Question

Ram can complete the work in 10 hours, Ajit in 12 hours and Suresh in 15 hours. All of them began the work together, but Ram had to leave the work after 2 hours of the start and Ajit left 3 hours before the completion of the work. How long did the work last?

Answer 1

The work lasted for 15 hours

Answer 2

total work =60
ram do 6 work in 1 hour
Ajit 5 in one hour
Suresh 4 in 1 hour
so left work after 2 hour and after ram leave is 60-30=30
anjit left work 3hour before completion so Ajit and Suresh did 18 work in next 2 hours
so remaining work 12 is done by Suresh 12/4 = in 3 hours
so total time is 2+2+3=7 hours