Problema Solution
One pump can drain a pool in 8 minutes. When a second pump is also used, the pool only takes 3 minutes to drain. How long would it take the second pool to drain if it were the only pump in use.
Answer provided by our tutors
One pump can drain a pool in 8 minutes this it can dry 1/8 pools per min
lets assume that the second pump needs x minutes to drain the pool alone thus it can drain 1/x pools per min
together they drain the pool in 3 min or 1/3 pools per min
1/8 + 1/x = 1/3
by solving we find:
x = 4.8 min
click here to see the step by step solution of the equation:
the second pump needs 4.8 minutes to drain the pool alone.