10 persons can fill up a watertank in 20 hours. How many persons are needed to fill it up in 5 hours?

Dear Student,

Please find below the solution to the asked query:

Given : To fill up a water tank in 20 hours we need 10 persons .

So,

To fill up a water tank in 1 hours we need 10 $\times$ 20 =  200 persons .

Therefore,

To fill up a water tank in 5 hours we need $\frac{200}{5}$ = 40 persons .                                                ( Ans )



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