ravi can do a piece of worj in 15 hours while raman can do it in 12 hours. How long will both take to do it, working together
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Ravi's 1 hour's work = 1/15 &
Raman's 1 hour's work =1/12
Both's 1 hour's work = 1/15+1/12 =9/60
let both take to do it in t hours
(9/60)t =1
t = 60/9h = 6h + (6×60)/9min
t = 6hour and 40 minute
Raman's 1 hour's work =1/12
Both's 1 hour's work = 1/15+1/12 =9/60
let both take to do it in t hours
(9/60)t =1
t = 60/9h = 6h + (6×60)/9min
t = 6hour and 40 minute
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