SOLUTION: a watertank empty in 42 seconds from 1st hole and empty in 30 seconds from the 2nd hole.in how many time the watertank will be empty when both holes are opened.make alinear equatio

Question 414687: a watertank empty in 42 seconds from 1st hole and empty in 30 seconds from the 2nd hole.in how many time the watertank will be empty when both holes are opened.make alinear equation and draw agraph.
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
a watertank empty in 42 seconds from 1st hole and empty in 30 seconds from the 2nd hole.in how many time the watertank will be empty when both holes are opened
.
Let x = time (seconds) for both holes to empty tank
then
x(1/42 + 1/30) = 1
multiply both sides by (42)(30)
x(30 + 42) = (42)(30)
x(72) = (42)(30)
x = (42)(30)/(72)
x = 17.5 seconds

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