book Maths Puzzle Numerical Ability

How do I do the following problem?

log 81=4
b^

Thank you for your help

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if a boat goes downstream at 72 miles in three hours, and upstream 60 miles in 6 hours, the rate of the river and the rate of the boat in still water respectively are_____________? A famer goes to the animal store and purchase horses at $10.00 per horse, goats at $1.00 per goat, and ducks at 8 ducks for $1.00. The farmer has $100.00 to spend and he only want