amy7
amy7

Time and work

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10.00 USD /single lesson (10 min.)
Science / Math

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nick amy7
country India
languages English, Hindi
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About me

let's understand a very important topic time and work

always consider work as 1 unit 

TO undertand this we take an example

Q) A does a work in 10 days and B does the same in 15 days. working together how many days will they take to complete?

solution-  since A does whole work in 10 days so we can write

in 10 days work done by A = 1 unit

so, in 1 day work done by A= 1/10 unit

similarly work done by B in 1 day = 1/15 unit

Now total work done by A&B together in 1 day=( 1/10) + (1/15)=    

                                                                                                     5/30=1/6

so, total days taken by A&B together =1/(1/6)=6 days.

Method 2-

total no. of days taken by A&B together= (10*15)/(10+15)

                                                                           =6 days.