rkhicha wrote:Q. If A&B can do a particular task in 15 hours, B&C can do the same task and 12 hours and A&C can complete it in 60/7 hours. How many hours will it take for A, B & C to complete it?
Thanks.
If A&B can do a particular task in 15 hours
A&B can do 1/15 of particular task in 1 hr
B&C can do the same task and 12 hours
B&C can do the 1/12 of same task in 1hours
A&C can complete it in 60/7 hours
A&C can complete7/60 of work in 1 hr
so adding 2(a+b+c) can complete 1/15+1/12+7/60 in 1 hour
2(a+b+c)=16/60 of work in 1 hr
a+b+c will complete 2/15 of work in 1 hr
so a+b+c will complete full wotk in 1/2/15=15/2 hrs
