One hour after Yolanda started walking from X to Y, a distance of 45 miles, Bob started walking along the same road from Y to X. If Yolanda's walking rate was 3 mph and Bob's was 4 mph, how many miles had Bob walked when they met?

Coins are to be put into 7 pockets so that each pocket contains at least one coin. At most 3 of the pockets are to contain the same number of coins, and no two of the remaining pockets are to contain an equal number of coins. What is the least possible number of coins needed?

Lloyd normally works 7.5 hours per day and earns $4.50 per hour. For each hour he works in excess of 7.5 hours on a given day, he is paid 1.5 times his regular rate. If Lloyd works 10.5 hours on a given day, how much does he earn for that day?

A tea shop offers tea in 5 different flavors and in 4 different package sizes. If the shop charges a different price for each combination, how many different prices must it list?

If x and y are positive integers, and x + y = 10, what is the maximum possible value of xy?