Question

X is 3 times as fast as y and is able to complete the work in 40 days less than y. find the time in which they can complete the work together

Answer 1

x=k days
y=3k
x=y-40
k=3k-40
2k=40
k=20
x=20 days
y=3k=3×20=60days
x+y
1/20 +1/60
3+1/60
4/60
1/15
x+y complete in 15 days