Question

1 tap can fill a tank in 15 hours and then can enter 20 hours if both are opened how many hours will be thankful

Answer 1

ANSWER :--

tank filling :-- 15 hours put that tank -- A

and empty :-- 20 hours put that tank -- B

his L.C.M. is :-- 60

capicity of tank A = 4
capicity of tank B = -3 ( there tank is empty so his capicity is negative )

when both are opened when his capicity = 4+(-3) = 4 - 3 = 1


when full filling tank time = 60/1 = 60 hours