A can do a piece of work in 6 days of 10 hours each and B can do it in 4 days of 5 hours each. How long will they take to do I, working together 1.20 hours a days?

Options
- 2.20 days
- 2.23 days
- 2.25 days
- 2.27 days

CORRECT ANSWER : 2.25 days

Discussion Board
How to solve

the right answer is 10 days. All the answer were wrong.
Approach to solve:take the work done by two in hours and compute total work done by them in hours.
Then find the total days=total hours/Total time

navin 04-14-2021 04:37 AM

Wrong options

A can do a piece of work in 6 days of 10 hours each so 6*10=60 hr and B can do it in 4 days of 5 hours each 4*5=20 hr

1/60+1/20=1/15

working together 1.20 hours a days

1.20/15=12.5 days



pranay 10-8-2020 03:06 AM

not correct answers

all the answers are wrong dear creators of this website dont spoil students life please

chetan 07-23-2020 11:07 AM

please provide solutions

please provide solutions...

abhishek 01-18-2020 05:08 AM

wrong options given

the answer should be 12.5 days.
for the given initial condition of A & B working seperately we may write
A*6*10=B*4*5
B=3A
now let A&B work together 1.2 hrs a day for x no.of days
then we can write (A+B)*x*1.2=A*6*10
(A+3A)*x*1.2=A*6*10
4A*x*1.2=A*60
x=A*60/A*4.8
thus we get x=12.5 days

riya 07-21-2019 04:57 AM

solution in detail

this is good to practice,but please explain for this 9th sum.

sugan 07-1-2017 07:48 AM

how to slove

please explain

ben 11-25-2016 12:09 AM

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