"A does `4/5` of a work in 20 days. He then calls B and they together finish
Channel: Doubtnut
Date: 2020-04-05

"A does `4/5` of a work in 20 days. He then calls B and they together finish the remaining work in 3 days. How long B alone would take to do the whole work ? 
a. `23\ d a y s`
b. `37\ d a y s`
c. `37 1/2 d a y s`
d. `40 d a y s`"