উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।
ব্যাখ্যা ও সঠিক সমাধান
উত্তর:
4hrs
A tap in 6 hours can fill 1 portion
A tap in 1 hours can fill 1/6 portion
By 1st 1/2 portion is filled by 3 hours
The left 1/2 portion is filled by 3 same tap
Now, By 1 tap 1/6 portion is filled in 1 hours
By. 3 tap 3/6 portion is filled in 1 hours
or 1/2 portion is filled in 1 hours
So, total required time is = (3 + 1) hours = 4 hours