"A man and a boy together can do a certain amount of digging in 40 days. Their speeds
Channel: Doubtnut
Date: 2020-04-12

Please "A man and a boy together can do a certain amount
 of digging in 40 days. Their speeds in digging are in the ratio of 8 : 5. How
 many days will the boy take to complete, the work it engaged alone? 
`2\ d a y s`
b. `68\ d a y s`
c. `80\ d a y s`
d. `104\ d a y s`"