Question

direct and inverse proportion ques 1.. 8 pipes are required to fill a tank in 75 min. how long will it take if only 4 pipes of the same type are used............... plz tell full solution.

Answer 1

only four types of the same type are used in X minutes
8 pipes for 75 min
4 pipes for x min
similarly,8/75=4/x
(by using cross multiplication )
x=4×75/8
x=37.5
hence,4 pipes can fill a tank in 37.5 minutes