Book Maths Puzzle Time Distance and Speed

the current in a typical Mississippi River shipping route flows at a rate of 4 mph. In order for a barge to travel 24 mi upriver and then return in a total of 5 hr, approximately h

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Sandi's Subaru travels 280 mi averaging a certain speed. If the car had gone 5 mph faster, the trip would have taken one hour less. Find Sandi's average speed. Two wells are used to fill a swimming pool. Working together, they can fill the pool in 4 hr. One well, working alone, can fill the pool in 6 hrs less than the other. How long wou