MBA Exam Numerical Ability Ratio and Proportion

the annual income and expenditure of a man and his wife are in the ratio of 5:3 and 3:1 respectively. if they decide to save equally and find a balance of rs.4000 at the end of the year, what was their income

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MBA Other Question

Two pipes X and Y can fill a tank in 25 hours and 20
hours respectively. Hari opened the pipes X and Y to
fill an empty tank and some times later he closed the
pipes X and Y when the tank was supposed to be
full. After that it was found that the tank was emptied
in 5 hours because an outlet pipe Z connected to the
tank was open from the beginning. If Hari closed the
pipe Z instead of closing pipes X and Y the remaining
tank would have been filled in what time ?
a^x=p, a^y=q and a^z=(p^yq^x)^z
Find xyz