Question

If it takes 4 minutes to fill a bucket with one tap and 6 minutes to fill the bucket with another tap. Using both taps how many seconds will it take to fill the bucket?

Answer 1

rate of 1st tap = 1/4
rate of 2nd tap = 1/6
rate of both taps = 1/4 + 1/6 = 5/12

time at combined rate = 1/(5/12) = 12/5 or 2.4 minutes

Answer 2

Basically see how many gal per minute or what ever unit of time you wish. Once you get what each tap fills per minute you add them.

Tap 1: per minute tap one has 1/4 a gal
Tap 2: per minute tap two has 1/6 a gal

Add them together 3/12+2/12= 5/12

So in one minute 5/12 of a gallon will be filled.

To see how many minutes it will take for a full gallon you have 1 gal divide amount per minute and you have 12/5, 2+2/5 or 2.4 minutes.

Answer 3

To answer do 69 x the highest amount divided by 420