Book Maths Puzzle Time Distance and Speed

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.

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Book Other Question

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 HOW TO SOLVE THE FOLLOWING

4X squared + 17x squared = 15

x squared + 4x-5=0

3x squared+1=7x