Question

the eficiency of A,B and c are in th eratio 5:3:2.working together ,they can complete a ask in 21 hours.in how many hours will B alone complete 40% of that task?

Answer 1

Answer:

28 hour

Step-by-step explanation:

Efficiency ratio = 5:3:2

Total efficiency or one hour work = 10

If they work for 21 hours,

Total work = 21 * 10 = 210 work

40 % of 210 = 84 work

B alone can complete 84 work = 84/3 = 28 hours