One Pool Pump can fill a pool in 16 hours

Question

One pump can fill a pool in 16hr

. Working with a second slower pump, the pumps together can fill the pool in 14hr

. How fast can the second pump fill the pool by itself?

Answer 1

1/16 + 1/x = 1/14

multiply by 112x

7x + 112 = 8x

x = 112

It takes the 2nd pump 112 hours to fill the pool by itself