Question

Three taps a, b and c can fill a tank in 12, 15 and 20 hours respectively. If a is open all the time and b and c are open for one hour each alternately, the tank will be filled in

Answer 1

Answer:

Step-by-step explanation:

a=12

b=15

c=20

LCM of a,b,c = 60

a in 1 hour = 60/12 = 5L

b "  "" " "" " = 60/15 = 4L

c " " " " " "" "= 60/20=3L

total to be filled = 60L

a+b+c=12L in 3 hours

time taken=60/12*3 = 15 hours