100m in 20s = 300m in 60s = 1 minute
so 300m x 60min = 18000m in 1hour
Answer: 18 kilometres per hour
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Call Joe's speed in kilometers per hour j and the distance Jill has travelled when they meet d. From the physical law that distance d travelled at constant speed equals the product of speed and time t and the problem statement, d = 3 X 3 and the distance travelled by Joe must be 16.5 - d = 7.5. The time walked by each is the same when they meet, since they started at the same time. Joe's speed is the distance he walked divided by the stated time of 3 hours, or 7.5/3 = 2.5 kilometers per hour.
Gus 10 Joe 14 `
Joe is 4 years old.
Joseph "Joe" McEldery born 1991 (age 18).
Joe has eaten 2/5, or 6/15 Jane has eaten 1/3, or 5/15 Joe = 6/15 Jane = 5/15 Joe has eaten one fifteenth more than Jane.