Math Problem

Where did the money go?

There were three friends having dinner together, when the waiter brought their bill, which was $30. Each paid $10.
After collecting the money the waiter realized that t he bill should have been $26 insted, dua to a special discount.
Unsure on how to divide $4 equally among three people, he put $1 in his pocket ang gave each person $1. This means that each person paid $9 for their dinner.
It happens that 9 x 3 + 1 = 28. What happened to the other $2?

>>7

Actually, in order to have an average speed of 50 mph, you would have to travel 54 6/11 mph for the third mile.

Think about it: If you travel at 40 mph for the first mile, it will take you 90 seconds to travel that mile. Likewise, it will take you 60 seconds to travel the second mile at 60 mph. 50 mph equals one mile per 72 seconds. In order to have an average speed of 50 mph over the three miles, you must cover 3 miles in 3*72=216 seconds in order to have a total distance/total time equal to 50 mph. You have already used 60+90=150 seconds; therefore, you must travel the remaining mile in 216-150=66 seconds. One mile per 66 seconds times 3600 seconds in an hour equals 54 and 6/11 miles per hour.

>>5
I think you are thinking of problems more like "If it takes a man 40 minutes to dig half a hole, how long does it take him to dig a hole?" This problem truly has no solution, because really, how does one dig half of a hole? Any hole you dig will be a whole hole.