exam
Maths Puzzle
Numerical Ability
If a car travels 20 km per hour between two cities. How fast must the car travel to average 40 km per hour for the round trip
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Can someone please help me solve this problem?
3-a-4/a+3=a^2-2/a+3
Thank you.
(w^2 - 1)/(w-1)^2 (w-1)/(w^2 + 2w +1)
I get a different answer every time I do it. I need all the steps. thank you