an average of 7.5 mph
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400 miles But Joe has forgotten about the cost of gas and his credit card has expired and his girlfriend is just about to leave him...
Well, if Joe runs 3 miles in 28 minutes, that means he's running at a pace of about 0.107 miles per minute. So, if he runs for 42 minutes at the same pace, he would cover approximately 4.5 miles. Math doesn't lie, honey!
In 1 minute bill washes 1/6 of a car and Joe washes 1/8 of a car. 1/6 + 1/8 = 14/48. A whole care = 48/48. Therefore you should divide 48 by 14 to get 3.429. However since this is in minutes you need to find how much seconds 0.429 of 1 minute is. 0.429 x 60 = 26 seconds (rounded). Add that to the original three minutes and you have 3 minutes 26 sec to wash the entire car working together.
Gus 10 Joe 14 `
Joe is 4 years old.