four equal pumps can fill a tank in 45 minutes. how long will 9 pumps of the same kind fill the tank? solutio​

Sagot :

Answer:

Use proportions

Let x = the time it will take for 6 pumps to fill tank

4 pumps : 42 mins = 6 pump : x mins

x = 63 mins

Check:

4 : 42 = 6 : 63

2 : 21 = 2 : 21