Question

A and B together take 5 days to do a b and c take 7 days to do the same and a and c take 4 days to do it who among these will take the least time if put to do it alone

Answer 1

its a good question..
A will take the least time when put to work alone....


regards
Kaush

Answer 2

Answer:

A will take the least time.

Step-by-step explanation:

A and B = 1 day = 1/5 day

B and C = 1 day = 1/7 day

C and A = 1 day = 1/4 day

2(A+B+C)= 1 day = 1/5+1/7+1/4 = 28+20+35/140 = 83/140  

C = 83/140 - 1/5 = 55/140 = 140/55 =2 30/140 days

A = 83/140 - 1/7 = 63/140 = 140/63 = 2 14/63 days

B = 83/140 - 1/4 = 48/140 = 140/ 48 = 2 44/48 days

Thus, A takes least time