Question

Two pipes a and b can fill a tank in 6 hour and 4 hour respectively if they are opened on alternate hour by short trick

Answer 1

Step-by-step explanation:

pipe a takes 6 hrs to fill the tank

tank filled by pipe a in one hour = 1/6

pipe b takes 4 hours to fill the tank

tank filled by pipe b in one hour = 1/4

a+b=4+6/24=10/24

time taken by alternately opening = 1 divided by 10/24

= 2.4 hours