Book Maths Puzzle Time and Work

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

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Book Other Question

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 Ellen paddles 1 mi upstream, and 1 mi back inb a total time of 1 hr. The speed of the river is 2 mph. Find the speed of Ellen's paddleboat in still water.