Question

A tap can fill up an empty tank in 7 hours and another in 5 hours. If both the taps are turned on at the same,
time, how long will it take to fill it up completely??​

Answer 1

Answer:

35/12 hours

Step-by-step explanation:

let the taps be a and b

then a 1 hour work= 1/7

b 1 hour work= 1/5

a+b 1 hour work= 1/5+1/7= 12/35

so they empty the tank in 35/12 hours