SOLUTION: to do certain work alone 'A' takes 4 hrs,'B' takes 5 hrs and c takes 6 hrs.how long would A and b together take to do a work which C can do in 4 n half hours?
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-> SOLUTION: to do certain work alone 'A' takes 4 hrs,'B' takes 5 hrs and c takes 6 hrs.how long would A and b together take to do a work which C can do in 4 n half hours?
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Question 590971: to do certain work alone 'A' takes 4 hrs,'B' takes 5 hrs and c takes 6 hrs.how long would A and b together take to do a work which C can do in 4 n half hours? Answer by richwmiller(17219) (Show Source):
You can put this solution on YOUR website! "A" is not the same as "a"
This is math. Be more precise.
[x/4+x/5+x/6=1
x=60/37
Together all three can do the first job in 60/37 hours.
a does 15/37 of the first job
b does 12/37 of the first job
c does 10/37 of the first job]
second job
4.5/6=3/4
c does the job in 3/4 of the time.
3/4 of 4=3
a does the job in 3 hours
3/4 of 5=15/4=3 3/4
b does the job in 3.75 hours
y/3 +y/3.75=1
Together a and b do the second job in 1 2/3 hours
