book Maths Puzzle Numerical Ability

4y-3(y+8)=12 can you please show how an tell how to solve

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Please help me with this problem:
Two cyclists start biking from a trail�s start 3 hours apart. The second cyclist travels at 10 miles per hour and starts 3 hours after the first A ski lift takes a skier up a slope at 50 meters/min.The skier then skis down the slope at 150meters/min. If one round trip takes 24 mins, how long is the slope?