Last Problem:
A man covers 27 miles in 9 hours and returns home at a speed of 5 miles per hour. What is his average speed for his entire journey?
Answer:
4 miles per hour
Since he covers 27 miles in 9 hrs getting to his destination, it means his speed is 3 miles per hour. For the return journey his speed is given is 5 mules per hours. He travels the same distance goes as coming, so the average speed is (3+5)/2 = 4 miles per hour.
Today’s Puzzle:
The product (multiplication) of the digits of a two digit number is 8. When 18 is added to the number, the digits are reversed. What is the number? (This is not so much a math problem but a puzzle to solve).