1.

A tap can fill a tank in 16 hhours whereas another tap can empty the tank it in 8 hours. If in a three fourth filled tank both the taps are opened, then how long will it take to empty the tank in this scenario?

Answer»

6 hours
8 hours
10 hours
12 hours

Solution :LET the capacity of the tank be C
Speed of inlet tap `= C//16`
Speed of outlet tap `= C//8`
DIFFERENCE in speed ` =C/8 - C/16 = C/16 ` hours
Time to EMPTY `3//4^(th)` of the tank ` = (3c//4)// C//16`
`=3C//4 xx 16//C=12` hours


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