Question

Two pipes A and B can fill a cistern in 371/2 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after

Answer 1

37 and 1/2 hours

Answer 2

Look at this formula :
To find the h they work togehether :
1/h1+1/h2+....1/hn=1/h____>h/1
OK ?!

Answer 3

k

Answer 4

75/2+1/45=1/30

Answer 5

right?

Answer 6

11/225=30

Answer 7

I realy dont understand your numbers :(
Can u write them for example :
h1=n
h2=r
OK ?!

Answer 8

h1=2/75,h2=1/45and h=1/30

Answer 9

look :
h1=275/100____>1/h1=1/175/100=100/275 .
OK ?!

Answer 10

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